Home / 1,389.29-1,920.66-1,377.14

Finding the Fourth Proportional to 1,389.29, 1,920.66 and 1,377.14

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Solution

The fourth proportional to 1,389.29, 1,920.66 and 1,377.14 is: 1,903.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,389.29 : 1,920.66 = 1,377.14 : x
  2. Step 2: Convert to fraction form
    1,389.29/1,920.66 = 1,377.14/x
  3. Step 3: Cross multiply
    1,389.29x = 1,920.66 × 1,377.14
  4. Step 4: Simplify right side
    1,389.29x = 2,645,017.71
  5. Step 5: Solve for x
    x = 2,645,017.71/1,389.29
  6. Step 6: Final answer
    x = 1,903.86

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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.