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Finding the Fourth Proportional to 869.12, 1,301.64 and 754.50

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Solution

The fourth proportional to 869.12, 1,301.64 and 754.50 is: 1,129.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    869.12 : 1,301.64 = 754.50 : x
  2. Step 2: Convert to fraction form
    869.12/1,301.64 = 754.50/x
  3. Step 3: Cross multiply
    869.12x = 1,301.64 × 754.50
  4. Step 4: Simplify right side
    869.12x = 982,087.38
  5. Step 5: Solve for x
    x = 982,087.38/869.12
  6. Step 6: Final answer
    x = 1,129.99

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.