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Finding the Fourth Proportional to 12,720.59, 17,550.45 and 7,342.34

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Solution

The fourth proportional to 12,720.59, 17,550.45 and 7,342.34 is: 10,130.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,720.59 : 17,550.45 = 7,342.34 : x
  2. Step 2: Convert to fraction form
    12,720.59/17,550.45 = 7,342.34/x
  3. Step 3: Cross multiply
    12,720.59x = 17,550.45 × 7,342.34
  4. Step 4: Simplify right side
    12,720.59x = 128,861,349.03
  5. Step 5: Solve for x
    x = 128,861,349.03/12,720.59
  6. Step 6: Final answer
    x = 10,130.14

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Double scale
Find fourth proportional to 12,721.59, 17,551.83 and 7,343.34
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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.