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Finding the Fourth Proportional to 488.53, 674.13 and 278.72

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Solution

The fourth proportional to 488.53, 674.13 and 278.72 is: 384.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    488.53 : 674.13 = 278.72 : x
  2. Step 2: Convert to fraction form
    488.53/674.13 = 278.72/x
  3. Step 3: Cross multiply
    488.53x = 674.13 × 278.72
  4. Step 4: Simplify right side
    488.53x = 187,892.82
  5. Step 5: Solve for x
    x = 187,892.82/488.53
  6. Step 6: Final answer
    x = 384.61

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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.