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Finding the Fourth Proportional to 920.92, 1,269.12 and 658.48

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Solution

The fourth proportional to 920.92, 1,269.12 and 658.48 is: 907.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    920.92 : 1,269.12 = 658.48 : x
  2. Step 2: Convert to fraction form
    920.92/1,269.12 = 658.48/x
  3. Step 3: Cross multiply
    920.92x = 1,269.12 × 658.48
  4. Step 4: Simplify right side
    920.92x = 835,690.14
  5. Step 5: Solve for x
    x = 835,690.14/920.92
  6. Step 6: Final answer
    x = 907.45

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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.