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Finding the Fourth Proportional to 666.45, 999.21 and 255.24

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Solution

The fourth proportional to 666.45, 999.21 and 255.24 is: 382.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    666.45 : 999.21 = 255.24 : x
  2. Step 2: Convert to fraction form
    666.45/999.21 = 255.24/x
  3. Step 3: Cross multiply
    666.45x = 999.21 × 255.24
  4. Step 4: Simplify right side
    666.45x = 255,038.36
  5. Step 5: Solve for x
    x = 255,038.36/666.45
  6. Step 6: Final answer
    x = 382.68

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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.