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Finding the Fourth Proportional to 666.58, 1,000.05 and 255.70

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Solution

The fourth proportional to 666.58, 1,000.05 and 255.70 is: 383.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    666.58 : 1,000.05 = 255.70 : x
  2. Step 2: Convert to fraction form
    666.58/1,000.05 = 255.70/x
  3. Step 3: Cross multiply
    666.58x = 1,000.05 × 255.70
  4. Step 4: Simplify right side
    666.58x = 255,712.79
  5. Step 5: Solve for x
    x = 255,712.79/666.58
  6. Step 6: Final answer
    x = 383.62

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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.