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Finding the Fourth Proportional to 644.12, 966.25 and 400.45

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Solution

The fourth proportional to 644.12, 966.25 and 400.45 is: 600.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    644.12 : 966.25 = 400.45 : x
  2. Step 2: Convert to fraction form
    644.12/966.25 = 400.45/x
  3. Step 3: Cross multiply
    644.12x = 966.25 × 400.45
  4. Step 4: Simplify right side
    644.12x = 386,931.40
  5. Step 5: Solve for x
    x = 386,931.40/644.12
  6. Step 6: Final answer
    x = 600.71

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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.