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Finding the Fourth Proportional to 666.90, 920.34 and 372.20

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Solution

The fourth proportional to 666.90, 920.34 and 372.20 is: 513.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    666.90 : 920.34 = 372.20 : x
  2. Step 2: Convert to fraction form
    666.90/920.34 = 372.20/x
  3. Step 3: Cross multiply
    666.90x = 920.34 × 372.20
  4. Step 4: Simplify right side
    666.90x = 342,550.55
  5. Step 5: Solve for x
    x = 342,550.55/666.90
  6. Step 6: Final answer
    x = 513.65

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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.