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Finding the Fourth Proportional to 422.01, 581.51 and 399.06

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Solution

The fourth proportional to 422.01, 581.51 and 399.06 is: 549.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    422.01 : 581.51 = 399.06 : x
  2. Step 2: Convert to fraction form
    422.01/581.51 = 399.06/x
  3. Step 3: Cross multiply
    422.01x = 581.51 × 399.06
  4. Step 4: Simplify right side
    422.01x = 232,058.38
  5. Step 5: Solve for x
    x = 232,058.38/422.01
  6. Step 6: Final answer
    x = 549.89

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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.