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Finding the Fourth Proportional to 542.44, 813.30 and 285.40

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Solution

The fourth proportional to 542.44, 813.30 and 285.40 is: 427.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    542.44 : 813.30 = 285.40 : x
  2. Step 2: Convert to fraction form
    542.44/813.30 = 285.40/x
  3. Step 3: Cross multiply
    542.44x = 813.30 × 285.40
  4. Step 4: Simplify right side
    542.44x = 232,115.82
  5. Step 5: Solve for x
    x = 232,115.82/542.44
  6. Step 6: Final answer
    x = 427.91

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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.