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Finding the Fourth Proportional to 901.92, 1,243.44 and 639.48

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Solution

The fourth proportional to 901.92, 1,243.44 and 639.48 is: 881.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    901.92 : 1,243.44 = 639.48 : x
  2. Step 2: Convert to fraction form
    901.92/1,243.44 = 639.48/x
  3. Step 3: Cross multiply
    901.92x = 1,243.44 × 639.48
  4. Step 4: Simplify right side
    901.92x = 795,155.01
  5. Step 5: Solve for x
    x = 795,155.01/901.92
  6. Step 6: Final answer
    x = 881.62

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Double scale
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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.