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Finding the Fourth Proportional to 711.05, 1,066.74 and 278.21

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Solution

The fourth proportional to 711.05, 1,066.74 and 278.21 is: 417.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    711.05 : 1,066.74 = 278.21 : x
  2. Step 2: Convert to fraction form
    711.05/1,066.74 = 278.21/x
  3. Step 3: Cross multiply
    711.05x = 1,066.74 × 278.21
  4. Step 4: Simplify right side
    711.05x = 296,780.40
  5. Step 5: Solve for x
    x = 296,780.40/711.05
  6. Step 6: Final answer
    x = 417.38

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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.