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Finding the Fourth Proportional to 766.70, 1,148.70 and 658.70

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Solution

The fourth proportional to 766.70, 1,148.70 and 658.70 is: 986.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    766.70 : 1,148.70 = 658.70 : x
  2. Step 2: Convert to fraction form
    766.70/1,148.70 = 658.70/x
  3. Step 3: Cross multiply
    766.70x = 1,148.70 × 658.70
  4. Step 4: Simplify right side
    766.70x = 756,648.69
  5. Step 5: Solve for x
    x = 756,648.69/766.70
  6. Step 6: Final answer
    x = 986.89

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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.