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Finding the Fourth Proportional to 869.74, 1,310.87 and 749.45

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Solution

The fourth proportional to 869.74, 1,310.87 and 749.45 is: 1,129.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    869.74 : 1,310.87 = 749.45 : x
  2. Step 2: Convert to fraction form
    869.74/1,310.87 = 749.45/x
  3. Step 3: Cross multiply
    869.74x = 1,310.87 × 749.45
  4. Step 4: Simplify right side
    869.74x = 982,436.67
  5. Step 5: Solve for x
    x = 982,436.67/869.74
  6. Step 6: Final answer
    x = 1,129.58

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.