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Finding the Fourth Proportional to 660.48, 911.12 and 411.72

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Solution

The fourth proportional to 660.48, 911.12 and 411.72 is: 567.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    660.48 : 911.12 = 411.72 : x
  2. Step 2: Convert to fraction form
    660.48/911.12 = 411.72/x
  3. Step 3: Cross multiply
    660.48x = 911.12 × 411.72
  4. Step 4: Simplify right side
    660.48x = 375,124.27
  5. Step 5: Solve for x
    x = 375,124.27/660.48
  6. Step 6: Final answer
    x = 567.96

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Double scale
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Similar ratio
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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.