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Finding the Fourth Proportional to 1,397.81, 1,938.20 and 1,351.55

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Solution

The fourth proportional to 1,397.81, 1,938.20 and 1,351.55 is: 1,874.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,397.81 : 1,938.20 = 1,351.55 : x
  2. Step 2: Convert to fraction form
    1,397.81/1,938.20 = 1,351.55/x
  3. Step 3: Cross multiply
    1,397.81x = 1,938.20 × 1,351.55
  4. Step 4: Simplify right side
    1,397.81x = 2,619,574.21
  5. Step 5: Solve for x
    x = 2,619,574.21/1,397.81
  6. Step 6: Final answer
    x = 1,874.06

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.39) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.