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Finding the Fourth Proportional to 312.90, 468.72 and 158.61

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Solution

The fourth proportional to 312.90, 468.72 and 158.61 is: 237.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    312.90 : 468.72 = 158.61 : x
  2. Step 2: Convert to fraction form
    312.90/468.72 = 158.61/x
  3. Step 3: Cross multiply
    312.90x = 468.72 × 158.61
  4. Step 4: Simplify right side
    312.90x = 74,343.68
  5. Step 5: Solve for x
    x = 74,343.68/312.90
  6. Step 6: Final answer
    x = 237.60

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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.