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Finding the Fourth Proportional to 40,569, 60,859.20 and 12,491.40

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Solution

The fourth proportional to 40,569, 60,859.20 and 12,491.40 is: 18,738.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    40,569 : 60,859.20 = 12,491.40 : x
  2. Step 2: Convert to fraction form
    40,569/60,859.20 = 12,491.40/x
  3. Step 3: Cross multiply
    40,569x = 60,859.20 × 12,491.40
  4. Step 4: Simplify right side
    40,569x = 760,216,610.88
  5. Step 5: Solve for x
    x = 760,216,610.88/40,569
  6. Step 6: Final answer
    x = 18,738.86

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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.