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Finding the Fourth Proportional to 267.78, 401.76 and 139.50

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Solution

The fourth proportional to 267.78, 401.76 and 139.50 is: 209.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    267.78 : 401.76 = 139.50 : x
  2. Step 2: Convert to fraction form
    267.78/401.76 = 139.50/x
  3. Step 3: Cross multiply
    267.78x = 401.76 × 139.50
  4. Step 4: Simplify right side
    267.78x = 56,045.52
  5. Step 5: Solve for x
    x = 56,045.52/267.78
  6. Step 6: Final answer
    x = 209.30

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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.