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Finding the Fourth Proportional to 898.88, 1,236.86 and 688.98

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Solution

The fourth proportional to 898.88, 1,236.86 and 688.98 is: 948.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    898.88 : 1,236.86 = 688.98 : x
  2. Step 2: Convert to fraction form
    898.88/1,236.86 = 688.98/x
  3. Step 3: Cross multiply
    898.88x = 1,236.86 × 688.98
  4. Step 4: Simplify right side
    898.88x = 852,174.04
  5. Step 5: Solve for x
    x = 852,174.04/898.88
  6. Step 6: Final answer
    x = 948.04

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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.