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Finding the Fourth Proportional to 666.41, 999.76 and 255.55

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Solution

The fourth proportional to 666.41, 999.76 and 255.55 is: 383.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    666.41 : 999.76 = 255.55 : x
  2. Step 2: Convert to fraction form
    666.41/999.76 = 255.55/x
  3. Step 3: Cross multiply
    666.41x = 999.76 × 255.55
  4. Step 4: Simplify right side
    666.41x = 255,484.61
  5. Step 5: Solve for x
    x = 255,484.61/666.41
  6. Step 6: Final answer
    x = 383.38

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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.