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Finding the Fourth Proportional to 8,187.30, 12,280.95 and 7,020.90

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Solution

The fourth proportional to 8,187.30, 12,280.95 and 7,020.90 is: 10,531.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,187.30 : 12,280.95 = 7,020.90 : x
  2. Step 2: Convert to fraction form
    8,187.30/12,280.95 = 7,020.90/x
  3. Step 3: Cross multiply
    8,187.30x = 12,280.95 × 7,020.90
  4. Step 4: Simplify right side
    8,187.30x = 86,223,321.86
  5. Step 5: Solve for x
    x = 86,223,321.86/8,187.30
  6. Step 6: Final answer
    x = 10,531.35

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Double scale
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Similar ratio
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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.