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Finding the Fourth Proportional to 72,140.60, 99,549.60 and 40,311.92

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Solution

The fourth proportional to 72,140.60, 99,549.60 and 40,311.92 is: 55,627.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,140.60 : 99,549.60 = 40,311.92 : x
  2. Step 2: Convert to fraction form
    72,140.60/99,549.60 = 40,311.92/x
  3. Step 3: Cross multiply
    72,140.60x = 99,549.60 × 40,311.92
  4. Step 4: Simplify right side
    72,140.60x = 4,013,035,511.23
  5. Step 5: Solve for x
    x = 4,013,035,511.23/72,140.60
  6. Step 6: Final answer
    x = 55,627.98

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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.