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Finding the Fourth Proportional to 12,720.33, 17,555.16 and 7,415.03

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Solution

The fourth proportional to 12,720.33, 17,555.16 and 7,415.03 is: 10,233.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,720.33 : 17,555.16 = 7,415.03 : x
  2. Step 2: Convert to fraction form
    12,720.33/17,555.16 = 7,415.03/x
  3. Step 3: Cross multiply
    12,720.33x = 17,555.16 × 7,415.03
  4. Step 4: Simplify right side
    12,720.33x = 130,172,038.05
  5. Step 5: Solve for x
    x = 130,172,038.05/12,720.33
  6. Step 6: Final answer
    x = 10,233.39

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Half scale
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Double scale
Find fourth proportional to 12,721.33, 17,556.54 and 7,416.03
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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.