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Finding the Fourth Proportional to 8,687.60, 11,986.80 and 5,151.68

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Solution

The fourth proportional to 8,687.60, 11,986.80 and 5,151.68 is: 7,108.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,687.60 : 11,986.80 = 5,151.68 : x
  2. Step 2: Convert to fraction form
    8,687.60/11,986.80 = 5,151.68/x
  3. Step 3: Cross multiply
    8,687.60x = 11,986.80 × 5,151.68
  4. Step 4: Simplify right side
    8,687.60x = 61,752,157.82
  5. Step 5: Solve for x
    x = 61,752,157.82/8,687.60
  6. Step 6: Final answer
    x = 7,108.08

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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.