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Finding the Fourth Proportional to 921.92, 1,272.96 and 920.12

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Solution

The fourth proportional to 921.92, 1,272.96 and 920.12 is: 1,270.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    921.92 : 1,272.96 = 920.12 : x
  2. Step 2: Convert to fraction form
    921.92/1,272.96 = 920.12/x
  3. Step 3: Cross multiply
    921.92x = 1,272.96 × 920.12
  4. Step 4: Simplify right side
    921.92x = 1,171,275.96
  5. Step 5: Solve for x
    x = 1,171,275.96/921.92
  6. Step 6: Final answer
    x = 1,270.47

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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.