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Finding the Fourth Proportional to 711.13, 1,067.30 and 278.59

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Solution

The fourth proportional to 711.13, 1,067.30 and 278.59 is: 418.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    711.13 : 1,067.30 = 278.59 : x
  2. Step 2: Convert to fraction form
    711.13/1,067.30 = 278.59/x
  3. Step 3: Cross multiply
    711.13x = 1,067.30 × 278.59
  4. Step 4: Simplify right side
    711.13x = 297,332.38
  5. Step 5: Solve for x
    x = 297,332.38/711.13
  6. Step 6: Final answer
    x = 418.12

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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.