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Finding the Fourth Proportional to 910.43, 1,256.78 and 631.59

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Solution

The fourth proportional to 910.43, 1,256.78 and 631.59 is: 871.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    910.43 : 1,256.78 = 631.59 : x
  2. Step 2: Convert to fraction form
    910.43/1,256.78 = 631.59/x
  3. Step 3: Cross multiply
    910.43x = 1,256.78 × 631.59
  4. Step 4: Simplify right side
    910.43x = 793,769.68
  5. Step 5: Solve for x
    x = 793,769.68/910.43
  6. Step 6: Final answer
    x = 871.86

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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.