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Finding the Fourth Proportional to 72,891.57, 100,590.57 and 42,270.60

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Solution

The fourth proportional to 72,891.57, 100,590.57 and 42,270.60 is: 58,333.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,891.57 : 100,590.57 = 42,270.60 : x
  2. Step 2: Convert to fraction form
    72,891.57/100,590.57 = 42,270.60/x
  3. Step 3: Cross multiply
    72,891.57x = 100,590.57 × 42,270.60
  4. Step 4: Simplify right side
    72,891.57x = 4,252,023,748.24
  5. Step 5: Solve for x
    x = 4,252,023,748.24/72,891.57
  6. Step 6: Final answer
    x = 58,333.55

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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.