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Finding the Fourth Proportional to 72,929.80, 100,643.10 and 39,395.80

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Solution

The fourth proportional to 72,929.80, 100,643.10 and 39,395.80 is: 54,366.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,929.80 : 100,643.10 = 39,395.80 : x
  2. Step 2: Convert to fraction form
    72,929.80/100,643.10 = 39,395.80/x
  3. Step 3: Cross multiply
    72,929.80x = 100,643.10 × 39,395.80
  4. Step 4: Simplify right side
    72,929.80x = 3,964,915,438.98
  5. Step 5: Solve for x
    x = 3,964,915,438.98/72,929.80
  6. Step 6: Final answer
    x = 54,366.19

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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.