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Finding the Fourth Proportional to 279.58, 387.45 and 275.66

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Solution

The fourth proportional to 279.58, 387.45 and 275.66 is: 382.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    279.58 : 387.45 = 275.66 : x
  2. Step 2: Convert to fraction form
    279.58/387.45 = 275.66/x
  3. Step 3: Cross multiply
    279.58x = 387.45 × 275.66
  4. Step 4: Simplify right side
    279.58x = 106,803.78
  5. Step 5: Solve for x
    x = 106,803.78/279.58
  6. Step 6: Final answer
    x = 382.02

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Why These Related Problems?

These problems maintain the same ratio (1.39) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.