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Finding the Fourth Proportional to 777.79, 1,072.18 and 611.72

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Solution

The fourth proportional to 777.79, 1,072.18 and 611.72 is: 843.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    777.79 : 1,072.18 = 611.72 : x
  2. Step 2: Convert to fraction form
    777.79/1,072.18 = 611.72/x
  3. Step 3: Cross multiply
    777.79x = 1,072.18 × 611.72
  4. Step 4: Simplify right side
    777.79x = 655,873.95
  5. Step 5: Solve for x
    x = 655,873.95/777.79
  6. Step 6: Final answer
    x = 843.25

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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.