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Finding the Fourth Proportional to 8,686.80, 11,989.08 and 7,358.40

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Solution

The fourth proportional to 8,686.80, 11,989.08 and 7,358.40 is: 10,155.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,686.80 : 11,989.08 = 7,358.40 : x
  2. Step 2: Convert to fraction form
    8,686.80/11,989.08 = 7,358.40/x
  3. Step 3: Cross multiply
    8,686.80x = 11,989.08 × 7,358.40
  4. Step 4: Simplify right side
    8,686.80x = 88,220,446.27
  5. Step 5: Solve for x
    x = 88,220,446.27/8,686.80
  6. Step 6: Final answer
    x = 10,155.69

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.