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Finding the Fourth Proportional to 698.05, 1,042.65 and 658.06

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Solution

The fourth proportional to 698.05, 1,042.65 and 658.06 is: 982.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    698.05 : 1,042.65 = 658.06 : x
  2. Step 2: Convert to fraction form
    698.05/1,042.65 = 658.06/x
  3. Step 3: Cross multiply
    698.05x = 1,042.65 × 658.06
  4. Step 4: Simplify right side
    698.05x = 686,126.26
  5. Step 5: Solve for x
    x = 686,126.26/698.05
  6. Step 6: Final answer
    x = 982.92

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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.