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Finding the Fourth Proportional to 693.63, 1,032.28 and 667.71

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Solution

The fourth proportional to 693.63, 1,032.28 and 667.71 is: 993.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    693.63 : 1,032.28 = 667.71 : x
  2. Step 2: Convert to fraction form
    693.63/1,032.28 = 667.71/x
  3. Step 3: Cross multiply
    693.63x = 1,032.28 × 667.71
  4. Step 4: Simplify right side
    693.63x = 689,262.01
  5. Step 5: Solve for x
    x = 689,262.01/693.63
  6. Step 6: Final answer
    x = 993.70

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.