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Finding the Fourth Proportional to 521.11, 782.01 and 479.40

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Solution

The fourth proportional to 521.11, 782.01 and 479.40 is: 719.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    521.11 : 782.01 = 479.40 : x
  2. Step 2: Convert to fraction form
    521.11/782.01 = 479.40/x
  3. Step 3: Cross multiply
    521.11x = 782.01 × 479.40
  4. Step 4: Simplify right side
    521.11x = 374,895.59
  5. Step 5: Solve for x
    x = 374,895.59/521.11
  6. Step 6: Final answer
    x = 719.42

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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.