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Finding the Fourth Proportional to 690.29, 1,040.18 and 571.22

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Solution

The fourth proportional to 690.29, 1,040.18 and 571.22 is: 860.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    690.29 : 1,040.18 = 571.22 : x
  2. Step 2: Convert to fraction form
    690.29/1,040.18 = 571.22/x
  3. Step 3: Cross multiply
    690.29x = 1,040.18 × 571.22
  4. Step 4: Simplify right side
    690.29x = 594,171.62
  5. Step 5: Solve for x
    x = 594,171.62/690.29
  6. Step 6: Final answer
    x = 860.76

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.