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Finding the Fourth Proportional to 312.66, 469.20 and 158.64

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Solution

The fourth proportional to 312.66, 469.20 and 158.64 is: 238.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    312.66 : 469.20 = 158.64 : x
  2. Step 2: Convert to fraction form
    312.66/469.20 = 158.64/x
  3. Step 3: Cross multiply
    312.66x = 469.20 × 158.64
  4. Step 4: Simplify right side
    312.66x = 74,433.89
  5. Step 5: Solve for x
    x = 74,433.89/312.66
  6. Step 6: Final answer
    x = 238.07

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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.