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Finding the Fourth Proportional to 72,920.13, 100,629.84 and 39,386.13

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Solution

The fourth proportional to 72,920.13, 100,629.84 and 39,386.13 is: 54,352.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,920.13 : 100,629.84 = 39,386.13 : x
  2. Step 2: Convert to fraction form
    72,920.13/100,629.84 = 39,386.13/x
  3. Step 3: Cross multiply
    72,920.13x = 100,629.84 × 39,386.13
  4. Step 4: Simplify right side
    72,920.13x = 3,963,419,960.12
  5. Step 5: Solve for x
    x = 3,963,419,960.12/72,920.13
  6. Step 6: Final answer
    x = 54,352.89

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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.