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Finding the Fourth Proportional to 56,687.60, 85,040.40 and 19,251.20

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Solution

The fourth proportional to 56,687.60, 85,040.40 and 19,251.20 is: 28,879.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    56,687.60 : 85,040.40 = 19,251.20 : x
  2. Step 2: Convert to fraction form
    56,687.60/85,040.40 = 19,251.20/x
  3. Step 3: Cross multiply
    56,687.60x = 85,040.40 × 19,251.20
  4. Step 4: Simplify right side
    56,687.60x = 1,637,129,748.48
  5. Step 5: Solve for x
    x = 1,637,129,748.48/56,687.60
  6. Step 6: Final answer
    x = 28,879.86

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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.