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Finding the Fourth Proportional to 266.10, 398.71 and 256.11

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Solution

The fourth proportional to 266.10, 398.71 and 256.11 is: 383.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    266.10 : 398.71 = 256.11 : x
  2. Step 2: Convert to fraction form
    266.10/398.71 = 256.11/x
  3. Step 3: Cross multiply
    266.10x = 398.71 × 256.11
  4. Step 4: Simplify right side
    266.10x = 102,113.62
  5. Step 5: Solve for x
    x = 102,113.62/266.10
  6. Step 6: Final answer
    x = 383.74

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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.