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Finding the Fourth Proportional to 312.88, 432.16 and 229.86

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Solution

The fourth proportional to 312.88, 432.16 and 229.86 is: 317.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    312.88 : 432.16 = 229.86 : x
  2. Step 2: Convert to fraction form
    312.88/432.16 = 229.86/x
  3. Step 3: Cross multiply
    312.88x = 432.16 × 229.86
  4. Step 4: Simplify right side
    312.88x = 99,336.30
  5. Step 5: Solve for x
    x = 99,336.30/312.88
  6. Step 6: Final answer
    x = 317.49

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.