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Finding the Fourth Proportional to 559.32, 772.34 and 393.90

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Solution

The fourth proportional to 559.32, 772.34 and 393.90 is: 543.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    559.32 : 772.34 = 393.90 : x
  2. Step 2: Convert to fraction form
    559.32/772.34 = 393.90/x
  3. Step 3: Cross multiply
    559.32x = 772.34 × 393.90
  4. Step 4: Simplify right side
    559.32x = 304,222.76
  5. Step 5: Solve for x
    x = 304,222.76/559.32
  6. Step 6: Final answer
    x = 543.92

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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.