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Finding the Fourth Proportional to 711.70, 1,066.81 and 249.31

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Solution

The fourth proportional to 711.70, 1,066.81 and 249.31 is: 373.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    711.70 : 1,066.81 = 249.31 : x
  2. Step 2: Convert to fraction form
    711.70/1,066.81 = 249.31/x
  3. Step 3: Cross multiply
    711.70x = 1,066.81 × 249.31
  4. Step 4: Simplify right side
    711.70x = 265,966.40
  5. Step 5: Solve for x
    x = 265,966.40/711.70
  6. Step 6: Final answer
    x = 373.71

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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.