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Finding the Fourth Proportional to 1,387.28, 1,913.64 and 994.40

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Solution

The fourth proportional to 1,387.28, 1,913.64 and 994.40 is: 1,371.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,387.28 : 1,913.64 = 994.40 : x
  2. Step 2: Convert to fraction form
    1,387.28/1,913.64 = 994.40/x
  3. Step 3: Cross multiply
    1,387.28x = 1,913.64 × 994.40
  4. Step 4: Simplify right side
    1,387.28x = 1,902,923.62
  5. Step 5: Solve for x
    x = 1,902,923.62/1,387.28
  6. Step 6: Final answer
    x = 1,371.69

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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.