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Finding the Fourth Proportional to 8,642.91, 11,920.46 and 6,658.95

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Solution

The fourth proportional to 8,642.91, 11,920.46 and 6,658.95 is: 9,184.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,642.91 : 11,920.46 = 6,658.95 : x
  2. Step 2: Convert to fraction form
    8,642.91/11,920.46 = 6,658.95/x
  3. Step 3: Cross multiply
    8,642.91x = 11,920.46 × 6,658.95
  4. Step 4: Simplify right side
    8,642.91x = 79,377,713.82
  5. Step 5: Solve for x
    x = 79,377,713.82/8,642.91
  6. Step 6: Final answer
    x = 9,184.14

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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.