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Finding the Fourth Proportional to 312.95, 469.31 and 158.78

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Solution

The fourth proportional to 312.95, 469.31 and 158.78 is: 238.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    312.95 : 469.31 = 158.78 : x
  2. Step 2: Convert to fraction form
    312.95/469.31 = 158.78/x
  3. Step 3: Cross multiply
    312.95x = 469.31 × 158.78
  4. Step 4: Simplify right side
    312.95x = 74,514.70
  5. Step 5: Solve for x
    x = 74,514.70/312.95
  6. Step 6: Final answer
    x = 238.10

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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.