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Finding the Fourth Proportional to 691.42, 1,037.94 and 485.14

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Solution

The fourth proportional to 691.42, 1,037.94 and 485.14 is: 728.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    691.42 : 1,037.94 = 485.14 : x
  2. Step 2: Convert to fraction form
    691.42/1,037.94 = 485.14/x
  3. Step 3: Cross multiply
    691.42x = 1,037.94 × 485.14
  4. Step 4: Simplify right side
    691.42x = 503,546.21
  5. Step 5: Solve for x
    x = 503,546.21/691.42
  6. Step 6: Final answer
    x = 728.28

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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.