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Finding the Fourth Proportional to 697.47, 1,046.60 and 642.39

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Solution

The fourth proportional to 697.47, 1,046.60 and 642.39 is: 963.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    697.47 : 1,046.60 = 642.39 : x
  2. Step 2: Convert to fraction form
    697.47/1,046.60 = 642.39/x
  3. Step 3: Cross multiply
    697.47x = 1,046.60 × 642.39
  4. Step 4: Simplify right side
    697.47x = 672,325.37
  5. Step 5: Solve for x
    x = 672,325.37/697.47
  6. Step 6: Final answer
    x = 963.95

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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.