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Finding the Fourth Proportional to 415.40, 572.80 and 275.47

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Solution

The fourth proportional to 415.40, 572.80 and 275.47 is: 379.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    415.40 : 572.80 = 275.47 : x
  2. Step 2: Convert to fraction form
    415.40/572.80 = 275.47/x
  3. Step 3: Cross multiply
    415.40x = 572.80 × 275.47
  4. Step 4: Simplify right side
    415.40x = 157,789.22
  5. Step 5: Solve for x
    x = 157,789.22/415.40
  6. Step 6: Final answer
    x = 379.85

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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.