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Finding the Fourth Proportional to 798.99, 1,100.40 and 688.43

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Solution

The fourth proportional to 798.99, 1,100.40 and 688.43 is: 948.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    798.99 : 1,100.40 = 688.43 : x
  2. Step 2: Convert to fraction form
    798.99/1,100.40 = 688.43/x
  3. Step 3: Cross multiply
    798.99x = 1,100.40 × 688.43
  4. Step 4: Simplify right side
    798.99x = 757,542.87
  5. Step 5: Solve for x
    x = 757,542.87/798.99
  6. Step 6: Final answer
    x = 948.13

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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.