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Finding the Fourth Proportional to 538.20, 807.42 and 477.72

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Solution

The fourth proportional to 538.20, 807.42 and 477.72 is: 716.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    538.20 : 807.42 = 477.72 : x
  2. Step 2: Convert to fraction form
    538.20/807.42 = 477.72/x
  3. Step 3: Cross multiply
    538.20x = 807.42 × 477.72
  4. Step 4: Simplify right side
    538.20x = 385,720.68
  5. Step 5: Solve for x
    x = 385,720.68/538.20
  6. Step 6: Final answer
    x = 716.69

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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.