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Finding the Fourth Proportional to 521.52, 779.30 and 357.90

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Solution

The fourth proportional to 521.52, 779.30 and 357.90 is: 534.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    521.52 : 779.30 = 357.90 : x
  2. Step 2: Convert to fraction form
    521.52/779.30 = 357.90/x
  3. Step 3: Cross multiply
    521.52x = 779.30 × 357.90
  4. Step 4: Simplify right side
    521.52x = 278,909.68
  5. Step 5: Solve for x
    x = 278,909.68/521.52
  6. Step 6: Final answer
    x = 534.80

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.