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Finding the Fourth Proportional to 12,720.38, 17,555.74 and 7,131.38

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Solution

The fourth proportional to 12,720.38, 17,555.74 and 7,131.38 is: 9,842.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,720.38 : 17,555.74 = 7,131.38 : x
  2. Step 2: Convert to fraction form
    12,720.38/17,555.74 = 7,131.38/x
  3. Step 3: Cross multiply
    12,720.38x = 17,555.74 × 7,131.38
  4. Step 4: Simplify right side
    12,720.38x = 125,196,547.51
  5. Step 5: Solve for x
    x = 125,196,547.51/12,720.38
  6. Step 6: Final answer
    x = 9,842.21

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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.