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Finding the Fourth Proportional to 72,929.75, 100,643.15 and 39,395.75

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Solution

The fourth proportional to 72,929.75, 100,643.15 and 39,395.75 is: 54,366.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,929.75 : 100,643.15 = 39,395.75 : x
  2. Step 2: Convert to fraction form
    72,929.75/100,643.15 = 39,395.75/x
  3. Step 3: Cross multiply
    72,929.75x = 100,643.15 × 39,395.75
  4. Step 4: Simplify right side
    72,929.75x = 3,964,912,179.63
  5. Step 5: Solve for x
    x = 3,964,912,179.63/72,929.75
  6. Step 6: Final answer
    x = 54,366.18

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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.