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Finding the Fourth Proportional to 72,687.78, 100,303.95 and 40,861.44

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Solution

The fourth proportional to 72,687.78, 100,303.95 and 40,861.44 is: 56,385.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,687.78 : 100,303.95 = 40,861.44 : x
  2. Step 2: Convert to fraction form
    72,687.78/100,303.95 = 40,861.44/x
  3. Step 3: Cross multiply
    72,687.78x = 100,303.95 × 40,861.44
  4. Step 4: Simplify right side
    72,687.78x = 4,098,563,834.69
  5. Step 5: Solve for x
    x = 4,098,563,834.69/72,687.78
  6. Step 6: Final answer
    x = 56,385.87

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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.