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Finding the Fourth Proportional to 806.68, 1,111.98 and 659.80

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Solution

The fourth proportional to 806.68, 1,111.98 and 659.80 is: 909.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    806.68 : 1,111.98 = 659.80 : x
  2. Step 2: Convert to fraction form
    806.68/1,111.98 = 659.80/x
  3. Step 3: Cross multiply
    806.68x = 1,111.98 × 659.80
  4. Step 4: Simplify right side
    806.68x = 733,684.40
  5. Step 5: Solve for x
    x = 733,684.40/806.68
  6. Step 6: Final answer
    x = 909.51

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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.