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Finding the Fourth Proportional to 697.70, 1,046.22 and 642.98

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Solution

The fourth proportional to 697.70, 1,046.22 and 642.98 is: 964.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    697.70 : 1,046.22 = 642.98 : x
  2. Step 2: Convert to fraction form
    697.70/1,046.22 = 642.98/x
  3. Step 3: Cross multiply
    697.70x = 1,046.22 × 642.98
  4. Step 4: Simplify right side
    697.70x = 672,697.23
  5. Step 5: Solve for x
    x = 672,697.23/697.70
  6. Step 6: Final answer
    x = 964.17

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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.