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Finding the Fourth Proportional to 1,149.24, 1,724.40 and 784.56

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Solution

The fourth proportional to 1,149.24, 1,724.40 and 784.56 is: 1,177.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,149.24 : 1,724.40 = 784.56 : x
  2. Step 2: Convert to fraction form
    1,149.24/1,724.40 = 784.56/x
  3. Step 3: Cross multiply
    1,149.24x = 1,724.40 × 784.56
  4. Step 4: Simplify right side
    1,149.24x = 1,352,895.26
  5. Step 5: Solve for x
    x = 1,352,895.26/1,149.24
  6. Step 6: Final answer
    x = 1,177.21

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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.