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Finding the Fourth Proportional to 790.25, 1,089.97 and 685.15

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Solution

The fourth proportional to 790.25, 1,089.97 and 685.15 is: 945.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    790.25 : 1,089.97 = 685.15 : x
  2. Step 2: Convert to fraction form
    790.25/1,089.97 = 685.15/x
  3. Step 3: Cross multiply
    790.25x = 1,089.97 × 685.15
  4. Step 4: Simplify right side
    790.25x = 746,792.95
  5. Step 5: Solve for x
    x = 746,792.95/790.25
  6. Step 6: Final answer
    x = 945.01

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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.