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Finding the Fourth Proportional to 71,885.78, 99,149.60 and 47,642.90

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Solution

The fourth proportional to 71,885.78, 99,149.60 and 47,642.90 is: 65,712.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    71,885.78 : 99,149.60 = 47,642.90 : x
  2. Step 2: Convert to fraction form
    71,885.78/99,149.60 = 47,642.90/x
  3. Step 3: Cross multiply
    71,885.78x = 99,149.60 × 47,642.90
  4. Step 4: Simplify right side
    71,885.78x = 4,723,774,477.84
  5. Step 5: Solve for x
    x = 4,723,774,477.84/71,885.78
  6. Step 6: Final answer
    x = 65,712.22

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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.