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Finding the Fourth Proportional to 450.68, 672.01 and 388.76

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Solution

The fourth proportional to 450.68, 672.01 and 388.76 is: 579.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    450.68 : 672.01 = 388.76 : x
  2. Step 2: Convert to fraction form
    450.68/672.01 = 388.76/x
  3. Step 3: Cross multiply
    450.68x = 672.01 × 388.76
  4. Step 4: Simplify right side
    450.68x = 261,250.61
  5. Step 5: Solve for x
    x = 261,250.61/450.68
  6. Step 6: Final answer
    x = 579.68

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.