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Finding the Fourth Proportional to 465.53, 642.71 and 279.08

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Solution

The fourth proportional to 465.53, 642.71 and 279.08 is: 385.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    465.53 : 642.71 = 279.08 : x
  2. Step 2: Convert to fraction form
    465.53/642.71 = 279.08/x
  3. Step 3: Cross multiply
    465.53x = 642.71 × 279.08
  4. Step 4: Simplify right side
    465.53x = 179,366.41
  5. Step 5: Solve for x
    x = 179,366.41/465.53
  6. Step 6: Final answer
    x = 385.30

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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.