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Finding the Fourth Proportional to 521.83, 781.73 and 278.02

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Solution

The fourth proportional to 521.83, 781.73 and 278.02 is: 416.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    521.83 : 781.73 = 278.02 : x
  2. Step 2: Convert to fraction form
    521.83/781.73 = 278.02/x
  3. Step 3: Cross multiply
    521.83x = 781.73 × 278.02
  4. Step 4: Simplify right side
    521.83x = 217,336.57
  5. Step 5: Solve for x
    x = 217,336.57/521.83
  6. Step 6: Final answer
    x = 416.49

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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.