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Finding the Fourth Proportional to 898.11, 1,239.21 and 688.53

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Solution

The fourth proportional to 898.11, 1,239.21 and 688.53 is: 950.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    898.11 : 1,239.21 = 688.53 : x
  2. Step 2: Convert to fraction form
    898.11/1,239.21 = 688.53/x
  3. Step 3: Cross multiply
    898.11x = 1,239.21 × 688.53
  4. Step 4: Simplify right side
    898.11x = 853,233.26
  5. Step 5: Solve for x
    x = 853,233.26/898.11
  6. Step 6: Final answer
    x = 950.03

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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.