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Finding the Fourth Proportional to 401.76, 555.12 and 291.60

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Solution

The fourth proportional to 401.76, 555.12 and 291.60 is: 402.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    401.76 : 555.12 = 291.60 : x
  2. Step 2: Convert to fraction form
    401.76/555.12 = 291.60/x
  3. Step 3: Cross multiply
    401.76x = 555.12 × 291.60
  4. Step 4: Simplify right side
    401.76x = 161,872.99
  5. Step 5: Solve for x
    x = 161,872.99/401.76
  6. Step 6: Final answer
    x = 402.91

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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.