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Finding the Fourth Proportional to 538.60, 807.90 and 495.40

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Solution

The fourth proportional to 538.60, 807.90 and 495.40 is: 743.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    538.60 : 807.90 = 495.40 : x
  2. Step 2: Convert to fraction form
    538.60/807.90 = 495.40/x
  3. Step 3: Cross multiply
    538.60x = 807.90 × 495.40
  4. Step 4: Simplify right side
    538.60x = 400,233.66
  5. Step 5: Solve for x
    x = 400,233.66/538.60
  6. Step 6: Final answer
    x = 743.10

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.