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Finding the Fourth Proportional to 938.72, 1,292.48 and 798.56

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Solution

The fourth proportional to 938.72, 1,292.48 and 798.56 is: 1,099.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    938.72 : 1,292.48 = 798.56 : x
  2. Step 2: Convert to fraction form
    938.72/1,292.48 = 798.56/x
  3. Step 3: Cross multiply
    938.72x = 1,292.48 × 798.56
  4. Step 4: Simplify right side
    938.72x = 1,032,122.83
  5. Step 5: Solve for x
    x = 1,032,122.83/938.72
  6. Step 6: Final answer
    x = 1,099.50

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Half scale
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Double scale
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Similar ratio
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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.