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Finding the Fourth Proportional to 711.34, 1,066.39 and 278.80

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Solution

The fourth proportional to 711.34, 1,066.39 and 278.80 is: 417.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    711.34 : 1,066.39 = 278.80 : x
  2. Step 2: Convert to fraction form
    711.34/1,066.39 = 278.80/x
  3. Step 3: Cross multiply
    711.34x = 1,066.39 × 278.80
  4. Step 4: Simplify right side
    711.34x = 297,309.53
  5. Step 5: Solve for x
    x = 297,309.53/711.34
  6. Step 6: Final answer
    x = 417.96

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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.