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Finding the Fourth Proportional to 784.12, 1,081.98 and 452.56

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Solution

The fourth proportional to 784.12, 1,081.98 and 452.56 is: 624.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    784.12 : 1,081.98 = 452.56 : x
  2. Step 2: Convert to fraction form
    784.12/1,081.98 = 452.56/x
  3. Step 3: Cross multiply
    784.12x = 1,081.98 × 452.56
  4. Step 4: Simplify right side
    784.12x = 489,660.87
  5. Step 5: Solve for x
    x = 489,660.87/784.12
  6. Step 6: Final answer
    x = 624.47

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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.