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Finding the Fourth Proportional to 1,012.78, 1,397.42 and 658.75

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Solution

The fourth proportional to 1,012.78, 1,397.42 and 658.75 is: 908.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,012.78 : 1,397.42 = 658.75 : x
  2. Step 2: Convert to fraction form
    1,012.78/1,397.42 = 658.75/x
  3. Step 3: Cross multiply
    1,012.78x = 1,397.42 × 658.75
  4. Step 4: Simplify right side
    1,012.78x = 920,550.43
  5. Step 5: Solve for x
    x = 920,550.43/1,012.78
  6. Step 6: Final answer
    x = 908.93

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.