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Finding the Fourth Proportional to 711.48, 1,069.14 and 671.39

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Solution

The fourth proportional to 711.48, 1,069.14 and 671.39 is: 1,008.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    711.48 : 1,069.14 = 671.39 : x
  2. Step 2: Convert to fraction form
    711.48/1,069.14 = 671.39/x
  3. Step 3: Cross multiply
    711.48x = 1,069.14 × 671.39
  4. Step 4: Simplify right side
    711.48x = 717,804.56
  5. Step 5: Solve for x
    x = 717,804.56/711.48
  6. Step 6: Final answer
    x = 1,008.89

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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.