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Finding the Fourth Proportional to 316.48, 437.12 and 280

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Solution

The fourth proportional to 316.48, 437.12 and 280 is: 386.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    316.48 : 437.12 = 280 : x
  2. Step 2: Convert to fraction form
    316.48/437.12 = 280/x
  3. Step 3: Cross multiply
    316.48x = 437.12 × 280
  4. Step 4: Simplify right side
    316.48x = 122,393.60
  5. Step 5: Solve for x
    x = 122,393.60/316.48
  6. Step 6: Final answer
    x = 386.73

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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.