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Finding the Fourth Proportional to 1,087.28, 1,630.42 and 539.24

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Solution

The fourth proportional to 1,087.28, 1,630.42 and 539.24 is: 808.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,087.28 : 1,630.42 = 539.24 : x
  2. Step 2: Convert to fraction form
    1,087.28/1,630.42 = 539.24/x
  3. Step 3: Cross multiply
    1,087.28x = 1,630.42 × 539.24
  4. Step 4: Simplify right side
    1,087.28x = 879,187.68
  5. Step 5: Solve for x
    x = 879,187.68/1,087.28
  6. Step 6: Final answer
    x = 808.61

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.