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Finding the Fourth Proportional to 784.46, 1,085.09 and 738.56

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Solution

The fourth proportional to 784.46, 1,085.09 and 738.56 is: 1,021.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    784.46 : 1,085.09 = 738.56 : x
  2. Step 2: Convert to fraction form
    784.46/1,085.09 = 738.56/x
  3. Step 3: Cross multiply
    784.46x = 1,085.09 × 738.56
  4. Step 4: Simplify right side
    784.46x = 801,394.95
  5. Step 5: Solve for x
    x = 801,394.95/784.46
  6. Step 6: Final answer
    x = 1,021.59

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1.5x scale

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.