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Finding the Fourth Proportional to 867.70, 1,196.94 and 631.38

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Solution

The fourth proportional to 867.70, 1,196.94 and 631.38 is: 870.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    867.70 : 1,196.94 = 631.38 : x
  2. Step 2: Convert to fraction form
    867.70/1,196.94 = 631.38/x
  3. Step 3: Cross multiply
    867.70x = 1,196.94 × 631.38
  4. Step 4: Simplify right side
    867.70x = 755,723.98
  5. Step 5: Solve for x
    x = 755,723.98/867.70
  6. Step 6: Final answer
    x = 870.95

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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.