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Finding the Fourth Proportional to 465.28, 642.16 and 278.88

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Solution

The fourth proportional to 465.28, 642.16 and 278.88 is: 384.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    465.28 : 642.16 = 278.88 : x
  2. Step 2: Convert to fraction form
    465.28/642.16 = 278.88/x
  3. Step 3: Cross multiply
    465.28x = 642.16 × 278.88
  4. Step 4: Simplify right side
    465.28x = 179,085.58
  5. Step 5: Solve for x
    x = 179,085.58/465.28
  6. Step 6: Final answer
    x = 384.90

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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.