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Finding the Fourth Proportional to 825.71, 1,138.79 and 678.08

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Solution

The fourth proportional to 825.71, 1,138.79 and 678.08 is: 935.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    825.71 : 1,138.79 = 678.08 : x
  2. Step 2: Convert to fraction form
    825.71/1,138.79 = 678.08/x
  3. Step 3: Cross multiply
    825.71x = 1,138.79 × 678.08
  4. Step 4: Simplify right side
    825.71x = 772,195.27
  5. Step 5: Solve for x
    x = 772,195.27/825.71
  6. Step 6: Final answer
    x = 935.20

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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.