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Finding the Fourth Proportional to 8,657.70, 12,986.55 and 8,147.40

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Solution

The fourth proportional to 8,657.70, 12,986.55 and 8,147.40 is: 12,221.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,657.70 : 12,986.55 = 8,147.40 : x
  2. Step 2: Convert to fraction form
    8,657.70/12,986.55 = 8,147.40/x
  3. Step 3: Cross multiply
    8,657.70x = 12,986.55 × 8,147.40
  4. Step 4: Simplify right side
    8,657.70x = 105,806,617.47
  5. Step 5: Solve for x
    x = 105,806,617.47/8,657.70
  6. Step 6: Final answer
    x = 12,221.10

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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.