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Finding the Fourth Proportional to 867.32, 1,195.78 and 631.60

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Solution

The fourth proportional to 867.32, 1,195.78 and 631.60 is: 870.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    867.32 : 1,195.78 = 631.60 : x
  2. Step 2: Convert to fraction form
    867.32/1,195.78 = 631.60/x
  3. Step 3: Cross multiply
    867.32x = 1,195.78 × 631.60
  4. Step 4: Simplify right side
    867.32x = 755,254.65
  5. Step 5: Solve for x
    x = 755,254.65/867.32
  6. Step 6: Final answer
    x = 870.79

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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.