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Finding the Fourth Proportional to 390.52, 538.95 and 224.75

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Solution

The fourth proportional to 390.52, 538.95 and 224.75 is: 310.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    390.52 : 538.95 = 224.75 : x
  2. Step 2: Convert to fraction form
    390.52/538.95 = 224.75/x
  3. Step 3: Cross multiply
    390.52x = 538.95 × 224.75
  4. Step 4: Simplify right side
    390.52x = 121,129.01
  5. Step 5: Solve for x
    x = 121,129.01/390.52
  6. Step 6: Final answer
    x = 310.18

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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.