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Finding the Fourth Proportional to 40,389.88, 60,594.40 and 12,687.88

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Solution

The fourth proportional to 40,389.88, 60,594.40 and 12,687.88 is: 19,034.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    40,389.88 : 60,594.40 = 12,687.88 : x
  2. Step 2: Convert to fraction form
    40,389.88/60,594.40 = 12,687.88/x
  3. Step 3: Cross multiply
    40,389.88x = 60,594.40 × 12,687.88
  4. Step 4: Simplify right side
    40,389.88x = 768,814,475.87
  5. Step 5: Solve for x
    x = 768,814,475.87/40,389.88
  6. Step 6: Final answer
    x = 19,034.83

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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.