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Finding the Fourth Proportional to 9,781.80, 14,640.30 and 8,615.40

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Solution

The fourth proportional to 9,781.80, 14,640.30 and 8,615.40 is: 12,894.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    9,781.80 : 14,640.30 = 8,615.40 : x
  2. Step 2: Convert to fraction form
    9,781.80/14,640.30 = 8,615.40/x
  3. Step 3: Cross multiply
    9,781.80x = 14,640.30 × 8,615.40
  4. Step 4: Simplify right side
    9,781.80x = 126,132,040.62
  5. Step 5: Solve for x
    x = 126,132,040.62/9,781.80
  6. Step 6: Final answer
    x = 12,894.56

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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.