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Finding the Fourth Proportional to 1,171.22, 1,756.43 and 520.79

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Solution

The fourth proportional to 1,171.22, 1,756.43 and 520.79 is: 781.00

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,171.22 : 1,756.43 = 520.79 : x
  2. Step 2: Convert to fraction form
    1,171.22/1,756.43 = 520.79/x
  3. Step 3: Cross multiply
    1,171.22x = 1,756.43 × 520.79
  4. Step 4: Simplify right side
    1,171.22x = 914,728.58
  5. Step 5: Solve for x
    x = 914,728.58/1,171.22
  6. Step 6: Final answer
    x = 781.00

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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.