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Finding the Fourth Proportional to 8,666.61, 11,959.90 and 4,687.79

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Solution

The fourth proportional to 8,666.61, 11,959.90 and 4,687.79 is: 6,469.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,666.61 : 11,959.90 = 4,687.79 : x
  2. Step 2: Convert to fraction form
    8,666.61/11,959.90 = 4,687.79/x
  3. Step 3: Cross multiply
    8,666.61x = 11,959.90 × 4,687.79
  4. Step 4: Simplify right side
    8,666.61x = 56,065,521.75
  5. Step 5: Solve for x
    x = 56,065,521.75/8,666.61
  6. Step 6: Final answer
    x = 6,469.14

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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.