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Finding the Fourth Proportional to 479.38, 718.95 and 186.78

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Solution

The fourth proportional to 479.38, 718.95 and 186.78 is: 280.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    479.38 : 718.95 = 186.78 : x
  2. Step 2: Convert to fraction form
    479.38/718.95 = 186.78/x
  3. Step 3: Cross multiply
    479.38x = 718.95 × 186.78
  4. Step 4: Simplify right side
    479.38x = 134,285.48
  5. Step 5: Solve for x
    x = 134,285.48/479.38
  6. Step 6: Final answer
    x = 280.12

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.