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Finding the Fourth Proportional to 465.66, 642.65 and 279.20

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Solution

The fourth proportional to 465.66, 642.65 and 279.20 is: 385.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    465.66 : 642.65 = 279.20 : x
  2. Step 2: Convert to fraction form
    465.66/642.65 = 279.20/x
  3. Step 3: Cross multiply
    465.66x = 642.65 × 279.20
  4. Step 4: Simplify right side
    465.66x = 179,423.27
  5. Step 5: Solve for x
    x = 179,423.27/465.66
  6. Step 6: Final answer
    x = 385.31

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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.