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Finding the Fourth Proportional to 521.67, 723.20 and 493.93

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Solution

The fourth proportional to 521.67, 723.20 and 493.93 is: 684.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    521.67 : 723.20 = 493.93 : x
  2. Step 2: Convert to fraction form
    521.67/723.20 = 493.93/x
  3. Step 3: Cross multiply
    521.67x = 723.20 × 493.93
  4. Step 4: Simplify right side
    521.67x = 357,207.13
  5. Step 5: Solve for x
    x = 357,207.13/521.67
  6. Step 6: Final answer
    x = 684.74

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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.