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Finding the Fourth Proportional to 316.48, 436.64 and 229.20

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Solution

The fourth proportional to 316.48, 436.64 and 229.20 is: 316.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    316.48 : 436.64 = 229.20 : x
  2. Step 2: Convert to fraction form
    316.48/436.64 = 229.20/x
  3. Step 3: Cross multiply
    316.48x = 436.64 × 229.20
  4. Step 4: Simplify right side
    316.48x = 100,077.89
  5. Step 5: Solve for x
    x = 100,077.89/316.48
  6. Step 6: Final answer
    x = 316.22

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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.