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Finding the Fourth Proportional to 72,873.70, 100,572.86 and 42,657.20

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Solution

The fourth proportional to 72,873.70, 100,572.86 and 42,657.20 is: 58,871.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,873.70 : 100,572.86 = 42,657.20 : x
  2. Step 2: Convert to fraction form
    72,873.70/100,572.86 = 42,657.20/x
  3. Step 3: Cross multiply
    72,873.70x = 100,572.86 × 42,657.20
  4. Step 4: Simplify right side
    72,873.70x = 4,290,156,603.59
  5. Step 5: Solve for x
    x = 4,290,156,603.59/72,873.70
  6. Step 6: Final answer
    x = 58,871.12

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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.