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Finding the Fourth Proportional to 807.66, 1,211.67 and 661.08

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Solution

The fourth proportional to 807.66, 1,211.67 and 661.08 is: 991.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    807.66 : 1,211.67 = 661.08 : x
  2. Step 2: Convert to fraction form
    807.66/1,211.67 = 661.08/x
  3. Step 3: Cross multiply
    807.66x = 1,211.67 × 661.08
  4. Step 4: Simplify right side
    807.66x = 801,010.80
  5. Step 5: Solve for x
    x = 801,010.80/807.66
  6. Step 6: Final answer
    x = 991.77

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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.