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Finding the Fourth Proportional to 56,657.20, 85,018.20 and 39,139.60

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Solution

The fourth proportional to 56,657.20, 85,018.20 and 39,139.60 is: 58,731.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    56,657.20 : 85,018.20 = 39,139.60 : x
  2. Step 2: Convert to fraction form
    56,657.20/85,018.20 = 39,139.60/x
  3. Step 3: Cross multiply
    56,657.20x = 85,018.20 × 39,139.60
  4. Step 4: Simplify right side
    56,657.20x = 3,327,578,340.72
  5. Step 5: Solve for x
    x = 3,327,578,340.72/56,657.20
  6. Step 6: Final answer
    x = 58,731.78

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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.