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Finding the Fourth Proportional to 31,479, 47,220.36 and 8,987.95

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Solution

The fourth proportional to 31,479, 47,220.36 and 8,987.95 is: 13,482.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    31,479 : 47,220.36 = 8,987.95 : x
  2. Step 2: Convert to fraction form
    31,479/47,220.36 = 8,987.95/x
  3. Step 3: Cross multiply
    31,479x = 47,220.36 × 8,987.95
  4. Step 4: Simplify right side
    31,479x = 424,414,189.72
  5. Step 5: Solve for x
    x = 424,414,189.72/31,479
  6. Step 6: Final answer
    x = 13,482.45

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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.