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Finding the Fourth Proportional to 309.12, 463.68 and 138.24

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Solution

The fourth proportional to 309.12, 463.68 and 138.24 is: 207.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    309.12 : 463.68 = 138.24 : x
  2. Step 2: Convert to fraction form
    309.12/463.68 = 138.24/x
  3. Step 3: Cross multiply
    309.12x = 463.68 × 138.24
  4. Step 4: Simplify right side
    309.12x = 64,099.12
  5. Step 5: Solve for x
    x = 64,099.12/309.12
  6. Step 6: Final answer
    x = 207.36

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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.