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Finding the Fourth Proportional to 698.92, 964.40 and 388.42

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Solution

The fourth proportional to 698.92, 964.40 and 388.42 is: 535.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    698.92 : 964.40 = 388.42 : x
  2. Step 2: Convert to fraction form
    698.92/964.40 = 388.42/x
  3. Step 3: Cross multiply
    698.92x = 964.40 × 388.42
  4. Step 4: Simplify right side
    698.92x = 374,592.25
  5. Step 5: Solve for x
    x = 374,592.25/698.92
  6. Step 6: Final answer
    x = 535.96

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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.