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Finding the Fourth Proportional to 1,393.14, 1,921.60 and 896.41

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Solution

The fourth proportional to 1,393.14, 1,921.60 and 896.41 is: 1,236.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,393.14 : 1,921.60 = 896.41 : x
  2. Step 2: Convert to fraction form
    1,393.14/1,921.60 = 896.41/x
  3. Step 3: Cross multiply
    1,393.14x = 1,921.60 × 896.41
  4. Step 4: Simplify right side
    1,393.14x = 1,722,541.46
  5. Step 5: Solve for x
    x = 1,722,541.46/1,393.14
  6. Step 6: Final answer
    x = 1,236.45

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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.