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Finding the Fourth Proportional to 936.72, 1,398.60 and 806.58

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Solution

The fourth proportional to 936.72, 1,398.60 and 806.58 is: 1,204.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    936.72 : 1,398.60 = 806.58 : x
  2. Step 2: Convert to fraction form
    936.72/1,398.60 = 806.58/x
  3. Step 3: Cross multiply
    936.72x = 1,398.60 × 806.58
  4. Step 4: Simplify right side
    936.72x = 1,128,082.79
  5. Step 5: Solve for x
    x = 1,128,082.79/936.72
  6. Step 6: Final answer
    x = 1,204.29

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.