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Finding the Fourth Proportional to 690.25, 952.55 and 428.42

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Solution

The fourth proportional to 690.25, 952.55 and 428.42 is: 591.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    690.25 : 952.55 = 428.42 : x
  2. Step 2: Convert to fraction form
    690.25/952.55 = 428.42/x
  3. Step 3: Cross multiply
    690.25x = 952.55 × 428.42
  4. Step 4: Simplify right side
    690.25x = 408,091.47
  5. Step 5: Solve for x
    x = 408,091.47/690.25
  6. Step 6: Final answer
    x = 591.22

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Half scale
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Double scale
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Similar ratio
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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.