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Finding the Fourth Proportional to 777.24, 1,164.78 and 661.23

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Solution

The fourth proportional to 777.24, 1,164.78 and 661.23 is: 990.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    777.24 : 1,164.78 = 661.23 : x
  2. Step 2: Convert to fraction form
    777.24/1,164.78 = 661.23/x
  3. Step 3: Cross multiply
    777.24x = 1,164.78 × 661.23
  4. Step 4: Simplify right side
    777.24x = 770,185.00
  5. Step 5: Solve for x
    x = 770,185.00/777.24
  6. Step 6: Final answer
    x = 990.92

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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.