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Finding the Fourth Proportional to 8,965.15, 12,371.68 and 5,187.79

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Solution

The fourth proportional to 8,965.15, 12,371.68 and 5,187.79 is: 7,159.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,965.15 : 12,371.68 = 5,187.79 : x
  2. Step 2: Convert to fraction form
    8,965.15/12,371.68 = 5,187.79/x
  3. Step 3: Cross multiply
    8,965.15x = 12,371.68 × 5,187.79
  4. Step 4: Simplify right side
    8,965.15x = 64,181,659.83
  5. Step 5: Solve for x
    x = 64,181,659.83/8,965.15
  6. Step 6: Final answer
    x = 7,159.02

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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.