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Finding the Fourth Proportional to 691.26, 1,035.06 and 495.66

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Solution

The fourth proportional to 691.26, 1,035.06 and 495.66 is: 742.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    691.26 : 1,035.06 = 495.66 : x
  2. Step 2: Convert to fraction form
    691.26/1,035.06 = 495.66/x
  3. Step 3: Cross multiply
    691.26x = 1,035.06 × 495.66
  4. Step 4: Simplify right side
    691.26x = 513,037.84
  5. Step 5: Solve for x
    x = 513,037.84/691.26
  6. Step 6: Final answer
    x = 742.18

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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.