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Finding the Fourth Proportional to 690.14, 952.36 and 395.40

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Solution

The fourth proportional to 690.14, 952.36 and 395.40 is: 545.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    690.14 : 952.36 = 395.40 : x
  2. Step 2: Convert to fraction form
    690.14/952.36 = 395.40/x
  3. Step 3: Cross multiply
    690.14x = 952.36 × 395.40
  4. Step 4: Simplify right side
    690.14x = 376,563.14
  5. Step 5: Solve for x
    x = 376,563.14/690.14
  6. Step 6: Final answer
    x = 545.63

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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.