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Finding the Fourth Proportional to 666.72, 920.22 and 445.76

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Solution

The fourth proportional to 666.72, 920.22 and 445.76 is: 615.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    666.72 : 920.22 = 445.76 : x
  2. Step 2: Convert to fraction form
    666.72/920.22 = 445.76/x
  3. Step 3: Cross multiply
    666.72x = 920.22 × 445.76
  4. Step 4: Simplify right side
    666.72x = 410,197.27
  5. Step 5: Solve for x
    x = 410,197.27/666.72
  6. Step 6: Final answer
    x = 615.25

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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.