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Finding the Fourth Proportional to 542.38, 813.58 and 298.78

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Solution

The fourth proportional to 542.38, 813.58 and 298.78 is: 448.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    542.38 : 813.58 = 298.78 : x
  2. Step 2: Convert to fraction form
    542.38/813.58 = 298.78/x
  3. Step 3: Cross multiply
    542.38x = 813.58 × 298.78
  4. Step 4: Simplify right side
    542.38x = 243,081.43
  5. Step 5: Solve for x
    x = 243,081.43/542.38
  6. Step 6: Final answer
    x = 448.18

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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.