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Finding the Fourth Proportional to 690.25, 952.71 and 395.69

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Solution

The fourth proportional to 690.25, 952.71 and 395.69 is: 546.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    690.25 : 952.71 = 395.69 : x
  2. Step 2: Convert to fraction form
    690.25/952.71 = 395.69/x
  3. Step 3: Cross multiply
    690.25x = 952.71 × 395.69
  4. Step 4: Simplify right side
    690.25x = 376,977.82
  5. Step 5: Solve for x
    x = 376,977.82/690.25
  6. Step 6: Final answer
    x = 546.15

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Double scale
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1.5x scale

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.