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Finding the Fourth Proportional to 723.20, 1,087.12 and 672.50

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Solution

The fourth proportional to 723.20, 1,087.12 and 672.50 is: 1,010.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    723.20 : 1,087.12 = 672.50 : x
  2. Step 2: Convert to fraction form
    723.20/1,087.12 = 672.50/x
  3. Step 3: Cross multiply
    723.20x = 1,087.12 × 672.50
  4. Step 4: Simplify right side
    723.20x = 731,088.20
  5. Step 5: Solve for x
    x = 731,088.20/723.20
  6. Step 6: Final answer
    x = 1,010.91

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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.