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Finding the Fourth Proportional to 8,687.84, 11,987.70 and 5,151.92

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Solution

The fourth proportional to 8,687.84, 11,987.70 and 5,151.92 is: 7,108.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,687.84 : 11,987.70 = 5,151.92 : x
  2. Step 2: Convert to fraction form
    8,687.84/11,987.70 = 5,151.92/x
  3. Step 3: Cross multiply
    8,687.84x = 11,987.70 × 5,151.92
  4. Step 4: Simplify right side
    8,687.84x = 61,759,671.38
  5. Step 5: Solve for x
    x = 61,759,671.38/8,687.84
  6. Step 6: Final answer
    x = 7,108.75

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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.