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Finding the Fourth Proportional to 697.90, 963.10 and 387.40

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Solution

The fourth proportional to 697.90, 963.10 and 387.40 is: 534.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    697.90 : 963.10 = 387.40 : x
  2. Step 2: Convert to fraction form
    697.90/963.10 = 387.40/x
  3. Step 3: Cross multiply
    697.90x = 963.10 × 387.40
  4. Step 4: Simplify right side
    697.90x = 373,104.94
  5. Step 5: Solve for x
    x = 373,104.94/697.90
  6. Step 6: Final answer
    x = 534.61

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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.