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Finding the Fourth Proportional to 690.57, 952.83 and 428.40

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Solution

The fourth proportional to 690.57, 952.83 and 428.40 is: 591.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    690.57 : 952.83 = 428.40 : x
  2. Step 2: Convert to fraction form
    690.57/952.83 = 428.40/x
  3. Step 3: Cross multiply
    690.57x = 952.83 × 428.40
  4. Step 4: Simplify right side
    690.57x = 408,192.37
  5. Step 5: Solve for x
    x = 408,192.37/690.57
  6. Step 6: Final answer
    x = 591.09

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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.