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Finding the Fourth Proportional to 8,686.74, 11,987.80 and 4,909.95

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Solution

The fourth proportional to 8,686.74, 11,987.80 and 4,909.95 is: 6,775.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,686.74 : 11,987.80 = 4,909.95 : x
  2. Step 2: Convert to fraction form
    8,686.74/11,987.80 = 4,909.95/x
  3. Step 3: Cross multiply
    8,686.74x = 11,987.80 × 4,909.95
  4. Step 4: Simplify right side
    8,686.74x = 58,859,486.34
  5. Step 5: Solve for x
    x = 58,859,486.34/8,686.74
  6. Step 6: Final answer
    x = 6,775.78

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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.