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Finding the Fourth Proportional to 465.88, 642.76 and 279.40

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Solution

The fourth proportional to 465.88, 642.76 and 279.40 is: 385.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    465.88 : 642.76 = 279.40 : x
  2. Step 2: Convert to fraction form
    465.88/642.76 = 279.40/x
  3. Step 3: Cross multiply
    465.88x = 642.76 × 279.40
  4. Step 4: Simplify right side
    465.88x = 179,587.14
  5. Step 5: Solve for x
    x = 179,587.14/465.88
  6. Step 6: Final answer
    x = 385.48

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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.