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Finding the Fourth Proportional to 312.61, 469.11 and 158.69

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Solution

The fourth proportional to 312.61, 469.11 and 158.69 is: 238.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    312.61 : 469.11 = 158.69 : x
  2. Step 2: Convert to fraction form
    312.61/469.11 = 158.69/x
  3. Step 3: Cross multiply
    312.61x = 469.11 × 158.69
  4. Step 4: Simplify right side
    312.61x = 74,443.07
  5. Step 5: Solve for x
    x = 74,443.07/312.61
  6. Step 6: Final answer
    x = 238.13

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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.