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Finding the Fourth Proportional to 798.13, 1,098.39 and 657.69

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Solution

The fourth proportional to 798.13, 1,098.39 and 657.69 is: 905.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    798.13 : 1,098.39 = 657.69 : x
  2. Step 2: Convert to fraction form
    798.13/1,098.39 = 657.69/x
  3. Step 3: Cross multiply
    798.13x = 1,098.39 × 657.69
  4. Step 4: Simplify right side
    798.13x = 722,406.70
  5. Step 5: Solve for x
    x = 722,406.70/798.13
  6. Step 6: Final answer
    x = 905.13

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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.