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Finding the Fourth Proportional to 666.92, 920.26 and 372.16

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Solution

The fourth proportional to 666.92, 920.26 and 372.16 is: 513.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    666.92 : 920.26 = 372.16 : x
  2. Step 2: Convert to fraction form
    666.92/920.26 = 372.16/x
  3. Step 3: Cross multiply
    666.92x = 920.26 × 372.16
  4. Step 4: Simplify right side
    666.92x = 342,480.73
  5. Step 5: Solve for x
    x = 342,480.73/666.92
  6. Step 6: Final answer
    x = 513.53

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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.