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Finding the Fourth Proportional to 690.44, 952.80 and 428.48

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Solution

The fourth proportional to 690.44, 952.80 and 428.48 is: 591.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    690.44 : 952.80 = 428.48 : x
  2. Step 2: Convert to fraction form
    690.44/952.80 = 428.48/x
  3. Step 3: Cross multiply
    690.44x = 952.80 × 428.48
  4. Step 4: Simplify right side
    690.44x = 408,255.74
  5. Step 5: Solve for x
    x = 408,255.74/690.44
  6. Step 6: Final answer
    x = 591.30

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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.