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Finding the Fourth Proportional to 691.72, 1,036.56 and 301.20

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Solution

The fourth proportional to 691.72, 1,036.56 and 301.20 is: 451.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    691.72 : 1,036.56 = 301.20 : x
  2. Step 2: Convert to fraction form
    691.72/1,036.56 = 301.20/x
  3. Step 3: Cross multiply
    691.72x = 1,036.56 × 301.20
  4. Step 4: Simplify right side
    691.72x = 312,211.87
  5. Step 5: Solve for x
    x = 312,211.87/691.72
  6. Step 6: Final answer
    x = 451.36

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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.