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Finding the Fourth Proportional to 72,335.50, 99,820.68 and 40,068.80

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Solution

The fourth proportional to 72,335.50, 99,820.68 and 40,068.80 is: 55,293.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,335.50 : 99,820.68 = 40,068.80 : x
  2. Step 2: Convert to fraction form
    72,335.50/99,820.68 = 40,068.80/x
  3. Step 3: Cross multiply
    72,335.50x = 99,820.68 × 40,068.80
  4. Step 4: Simplify right side
    72,335.50x = 3,999,694,862.78
  5. Step 5: Solve for x
    x = 3,999,694,862.78/72,335.50
  6. Step 6: Final answer
    x = 55,293.66

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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.