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Finding the Fourth Proportional to 797.68, 1,098.56 and 643.24

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Solution

The fourth proportional to 797.68, 1,098.56 and 643.24 is: 885.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    797.68 : 1,098.56 = 643.24 : x
  2. Step 2: Convert to fraction form
    797.68/1,098.56 = 643.24/x
  3. Step 3: Cross multiply
    797.68x = 1,098.56 × 643.24
  4. Step 4: Simplify right side
    797.68x = 706,637.73
  5. Step 5: Solve for x
    x = 706,637.73/797.68
  6. Step 6: Final answer
    x = 885.87

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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.