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Finding the Fourth Proportional to 690.13, 952.36 and 391.37

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Solution

The fourth proportional to 690.13, 952.36 and 391.37 is: 540.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    690.13 : 952.36 = 391.37 : x
  2. Step 2: Convert to fraction form
    690.13/952.36 = 391.37/x
  3. Step 3: Cross multiply
    690.13x = 952.36 × 391.37
  4. Step 4: Simplify right side
    690.13x = 372,725.13
  5. Step 5: Solve for x
    x = 372,725.13/690.13
  6. Step 6: Final answer
    x = 540.08

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.