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Finding the Fourth Proportional to 823.68, 1,138.05 and 648.72

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Solution

The fourth proportional to 823.68, 1,138.05 and 648.72 is: 896.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    823.68 : 1,138.05 = 648.72 : x
  2. Step 2: Convert to fraction form
    823.68/1,138.05 = 648.72/x
  3. Step 3: Cross multiply
    823.68x = 1,138.05 × 648.72
  4. Step 4: Simplify right side
    823.68x = 738,275.80
  5. Step 5: Solve for x
    x = 738,275.80/823.68
  6. Step 6: Final answer
    x = 896.31

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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.