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Finding the Fourth Proportional to 31,779, 47,681.72 and 14,000.56

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Solution

The fourth proportional to 31,779, 47,681.72 and 14,000.56 is: 21,006.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    31,779 : 47,681.72 = 14,000.56 : x
  2. Step 2: Convert to fraction form
    31,779/47,681.72 = 14,000.56/x
  3. Step 3: Cross multiply
    31,779x = 47,681.72 × 14,000.56
  4. Step 4: Simplify right side
    31,779x = 667,570,781.76
  5. Step 5: Solve for x
    x = 667,570,781.76/31,779
  6. Step 6: Final answer
    x = 21,006.66

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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.