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Finding the Fourth Proportional to 891.84, 1,335.42 and 685.92

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Solution

The fourth proportional to 891.84, 1,335.42 and 685.92 is: 1,027.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    891.84 : 1,335.42 = 685.92 : x
  2. Step 2: Convert to fraction form
    891.84/1,335.42 = 685.92/x
  3. Step 3: Cross multiply
    891.84x = 1,335.42 × 685.92
  4. Step 4: Simplify right side
    891.84x = 915,991.29
  5. Step 5: Solve for x
    x = 915,991.29/891.84
  6. Step 6: Final answer
    x = 1,027.08

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.