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Finding the Fourth Proportional to 401.76, 554.13 and 261.72

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Solution

The fourth proportional to 401.76, 554.13 and 261.72 is: 360.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    401.76 : 554.13 = 261.72 : x
  2. Step 2: Convert to fraction form
    401.76/554.13 = 261.72/x
  3. Step 3: Cross multiply
    401.76x = 554.13 × 261.72
  4. Step 4: Simplify right side
    401.76x = 145,026.90
  5. Step 5: Solve for x
    x = 145,026.90/401.76
  6. Step 6: Final answer
    x = 360.98

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.