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Finding the Fourth Proportional to 8,390.52, 12,642.62 and 6,961.68

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Solution

The fourth proportional to 8,390.52, 12,642.62 and 6,961.68 is: 10,489.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,390.52 : 12,642.62 = 6,961.68 : x
  2. Step 2: Convert to fraction form
    8,390.52/12,642.62 = 6,961.68/x
  3. Step 3: Cross multiply
    8,390.52x = 12,642.62 × 6,961.68
  4. Step 4: Simplify right side
    8,390.52x = 88,013,839.99
  5. Step 5: Solve for x
    x = 88,013,839.99/8,390.52
  6. Step 6: Final answer
    x = 10,489.68

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.