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Finding the Fourth Proportional to 666.47, 999.72 and 255.64

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Solution

The fourth proportional to 666.47, 999.72 and 255.64 is: 383.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    666.47 : 999.72 = 255.64 : x
  2. Step 2: Convert to fraction form
    666.47/999.72 = 255.64/x
  3. Step 3: Cross multiply
    666.47x = 999.72 × 255.64
  4. Step 4: Simplify right side
    666.47x = 255,568.42
  5. Step 5: Solve for x
    x = 255,568.42/666.47
  6. Step 6: Final answer
    x = 383.47

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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.