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Finding the Fourth Proportional to 72,335.80, 99,820.65 and 40,503.11

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Solution

The fourth proportional to 72,335.80, 99,820.65 and 40,503.11 is: 55,892.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,335.80 : 99,820.65 = 40,503.11 : x
  2. Step 2: Convert to fraction form
    72,335.80/99,820.65 = 40,503.11/x
  3. Step 3: Cross multiply
    72,335.80x = 99,820.65 × 40,503.11
  4. Step 4: Simplify right side
    72,335.80x = 4,043,046,420.00
  5. Step 5: Solve for x
    x = 4,043,046,420.00/72,335.80
  6. Step 6: Final answer
    x = 55,892.74

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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.