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Finding the Fourth Proportional to 649.12, 972.12 and 440.50

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Solution

The fourth proportional to 649.12, 972.12 and 440.50 is: 659.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    649.12 : 972.12 = 440.50 : x
  2. Step 2: Convert to fraction form
    649.12/972.12 = 440.50/x
  3. Step 3: Cross multiply
    649.12x = 972.12 × 440.50
  4. Step 4: Simplify right side
    649.12x = 428,218.86
  5. Step 5: Solve for x
    x = 428,218.86/649.12
  6. Step 6: Final answer
    x = 659.69

Related Problems

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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.