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Finding the Fourth Proportional to 417.31, 574.81 and 291.05

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Solution

The fourth proportional to 417.31, 574.81 and 291.05 is: 400.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    417.31 : 574.81 = 291.05 : x
  2. Step 2: Convert to fraction form
    417.31/574.81 = 291.05/x
  3. Step 3: Cross multiply
    417.31x = 574.81 × 291.05
  4. Step 4: Simplify right side
    417.31x = 167,297.82
  5. Step 5: Solve for x
    x = 167,297.82/417.31
  6. Step 6: Final answer
    x = 400.90

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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.