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Finding the Fourth Proportional to 415.10, 572.40 and 290.72

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Solution

The fourth proportional to 415.10, 572.40 and 290.72 is: 400.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    415.10 : 572.40 = 290.72 : x
  2. Step 2: Convert to fraction form
    415.10/572.40 = 290.72/x
  3. Step 3: Cross multiply
    415.10x = 572.40 × 290.72
  4. Step 4: Simplify right side
    415.10x = 166,405.27
  5. Step 5: Solve for x
    x = 166,405.27/415.10
  6. Step 6: Final answer
    x = 400.88

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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.