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Finding the Fourth Proportional to 915.66, 1,372.87 and 440.49

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Solution

The fourth proportional to 915.66, 1,372.87 and 440.49 is: 660.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    915.66 : 1,372.87 = 440.49 : x
  2. Step 2: Convert to fraction form
    915.66/1,372.87 = 440.49/x
  3. Step 3: Cross multiply
    915.66x = 1,372.87 × 440.49
  4. Step 4: Simplify right side
    915.66x = 604,742.34
  5. Step 5: Solve for x
    x = 604,742.34/915.66
  6. Step 6: Final answer
    x = 660.44

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Half scale
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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 (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.