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Finding the Fourth Proportional to 31,811.20, 47,704.65 and 9,617.20

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Solution

The fourth proportional to 31,811.20, 47,704.65 and 9,617.20 is: 14,422.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    31,811.20 : 47,704.65 = 9,617.20 : x
  2. Step 2: Convert to fraction form
    31,811.20/47,704.65 = 9,617.20/x
  3. Step 3: Cross multiply
    31,811.20x = 47,704.65 × 9,617.20
  4. Step 4: Simplify right side
    31,811.20x = 458,785,159.98
  5. Step 5: Solve for x
    x = 458,785,159.98/31,811.20
  6. Step 6: Final answer
    x = 14,422.13

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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.