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Finding the Fourth Proportional to 964.81, 1,447.90 and 691.13

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Solution

The fourth proportional to 964.81, 1,447.90 and 691.13 is: 1,037.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    964.81 : 1,447.90 = 691.13 : x
  2. Step 2: Convert to fraction form
    964.81/1,447.90 = 691.13/x
  3. Step 3: Cross multiply
    964.81x = 1,447.90 × 691.13
  4. Step 4: Simplify right side
    964.81x = 1,000,683.67
  5. Step 5: Solve for x
    x = 1,000,683.67/964.81
  6. Step 6: Final answer
    x = 1,037.18

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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.