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Finding the Fourth Proportional to 18,781.59, 28,147.77 and 7,675.61

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Solution

The fourth proportional to 18,781.59, 28,147.77 and 7,675.61 is: 11,503.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,781.59 : 28,147.77 = 7,675.61 : x
  2. Step 2: Convert to fraction form
    18,781.59/28,147.77 = 7,675.61/x
  3. Step 3: Cross multiply
    18,781.59x = 28,147.77 × 7,675.61
  4. Step 4: Simplify right side
    18,781.59x = 216,051,304.89
  5. Step 5: Solve for x
    x = 216,051,304.89/18,781.59
  6. Step 6: Final answer
    x = 11,503.36

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1.5x scale

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.