Home / 1,388.29-1,919.28-1,376.14

Finding the Fourth Proportional to 1,388.29, 1,919.28 and 1,376.14

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Solution

The fourth proportional to 1,388.29, 1,919.28 and 1,376.14 is: 1,902.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,388.29 : 1,919.28 = 1,376.14 : x
  2. Step 2: Convert to fraction form
    1,388.29/1,919.28 = 1,376.14/x
  3. Step 3: Cross multiply
    1,388.29x = 1,919.28 × 1,376.14
  4. Step 4: Simplify right side
    1,388.29x = 2,641,197.98
  5. Step 5: Solve for x
    x = 2,641,197.98/1,388.29
  6. Step 6: Final answer
    x = 1,902.48

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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.