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Finding the Fourth Proportional to 961.47, 1,439.68 and 631.36

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Solution

The fourth proportional to 961.47, 1,439.68 and 631.36 is: 945.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    961.47 : 1,439.68 = 631.36 : x
  2. Step 2: Convert to fraction form
    961.47/1,439.68 = 631.36/x
  3. Step 3: Cross multiply
    961.47x = 1,439.68 × 631.36
  4. Step 4: Simplify right side
    961.47x = 908,956.36
  5. Step 5: Solve for x
    x = 908,956.36/961.47
  6. Step 6: Final answer
    x = 945.38

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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.