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Finding the Fourth Proportional to 72,839.78, 100,518.86 and 42,630.85

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Solution

The fourth proportional to 72,839.78, 100,518.86 and 42,630.85 is: 58,830.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,839.78 : 100,518.86 = 42,630.85 : x
  2. Step 2: Convert to fraction form
    72,839.78/100,518.86 = 42,630.85/x
  3. Step 3: Cross multiply
    72,839.78x = 100,518.86 × 42,630.85
  4. Step 4: Simplify right side
    72,839.78x = 4,285,204,298.11
  5. Step 5: Solve for x
    x = 4,285,204,298.11/72,839.78
  6. Step 6: Final answer
    x = 58,830.55

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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.