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Finding the Fourth Proportional to 711.32, 1,067.12 and 278.45

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Solution

The fourth proportional to 711.32, 1,067.12 and 278.45 is: 417.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    711.32 : 1,067.12 = 278.45 : x
  2. Step 2: Convert to fraction form
    711.32/1,067.12 = 278.45/x
  3. Step 3: Cross multiply
    711.32x = 1,067.12 × 278.45
  4. Step 4: Simplify right side
    711.32x = 297,132.84
  5. Step 5: Solve for x
    x = 297,132.84/711.32
  6. Step 6: Final answer
    x = 417.72

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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.