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Finding the Fourth Proportional to 711.14, 1,058.32 and 685.22

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Solution

The fourth proportional to 711.14, 1,058.32 and 685.22 is: 1,019.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    711.14 : 1,058.32 = 685.22 : x
  2. Step 2: Convert to fraction form
    711.14/1,058.32 = 685.22/x
  3. Step 3: Cross multiply
    711.14x = 1,058.32 × 685.22
  4. Step 4: Simplify right side
    711.14x = 725,182.03
  5. Step 5: Solve for x
    x = 725,182.03/711.14
  6. Step 6: Final answer
    x = 1,019.75

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.