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Finding the Fourth Proportional to 72,402.13, 108,603.29 and 19,812.07

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Solution

The fourth proportional to 72,402.13, 108,603.29 and 19,812.07 is: 29,718.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,402.13 : 108,603.29 = 19,812.07 : x
  2. Step 2: Convert to fraction form
    72,402.13/108,603.29 = 19,812.07/x
  3. Step 3: Cross multiply
    72,402.13x = 108,603.29 × 19,812.07
  4. Step 4: Simplify right side
    72,402.13x = 2,151,655,983.71
  5. Step 5: Solve for x
    x = 2,151,655,983.71/72,402.13
  6. Step 6: Final answer
    x = 29,718.13

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.