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Finding the Fourth Proportional to 521, 781.83 and 277.69

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Solution

The fourth proportional to 521, 781.83 and 277.69 is: 416.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    521 : 781.83 = 277.69 : x
  2. Step 2: Convert to fraction form
    521/781.83 = 277.69/x
  3. Step 3: Cross multiply
    521x = 781.83 × 277.69
  4. Step 4: Simplify right side
    521x = 217,101.08
  5. Step 5: Solve for x
    x = 217,101.08/521
  6. Step 6: Final answer
    x = 416.70

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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.