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Finding the Fourth Proportional to 1,331.38, 1,994.78 and 715.38

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Solution

The fourth proportional to 1,331.38, 1,994.78 and 715.38 is: 1,071.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,331.38 : 1,994.78 = 715.38 : x
  2. Step 2: Convert to fraction form
    1,331.38/1,994.78 = 715.38/x
  3. Step 3: Cross multiply
    1,331.38x = 1,994.78 × 715.38
  4. Step 4: Simplify right side
    1,331.38x = 1,427,025.72
  5. Step 5: Solve for x
    x = 1,427,025.72/1,331.38
  6. Step 6: Final answer
    x = 1,071.84

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.