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Finding the Fourth Proportional to 56,747.90, 85,121.85 and 47,999.90

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Solution

The fourth proportional to 56,747.90, 85,121.85 and 47,999.90 is: 71,999.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    56,747.90 : 85,121.85 = 47,999.90 : x
  2. Step 2: Convert to fraction form
    56,747.90/85,121.85 = 47,999.90/x
  3. Step 3: Cross multiply
    56,747.90x = 85,121.85 × 47,999.90
  4. Step 4: Simplify right side
    56,747.90x = 4,085,840,287.82
  5. Step 5: Solve for x
    x = 4,085,840,287.82/56,747.90
  6. Step 6: Final answer
    x = 71,999.85

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.