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Finding the Fourth Proportional to 72,175.15, 99,599.63 and 39,909.20

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Solution

The fourth proportional to 72,175.15, 99,599.63 and 39,909.20 is: 55,073.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,175.15 : 99,599.63 = 39,909.20 : x
  2. Step 2: Convert to fraction form
    72,175.15/99,599.63 = 39,909.20/x
  3. Step 3: Cross multiply
    72,175.15x = 99,599.63 × 39,909.20
  4. Step 4: Simplify right side
    72,175.15x = 3,974,941,354.05
  5. Step 5: Solve for x
    x = 3,974,941,354.05/72,175.15
  6. Step 6: Final answer
    x = 55,073.55

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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.