Home / 2,018.29-2,787.36-1,390.45

Finding the Fourth Proportional to 2,018.29, 2,787.36 and 1,390.45

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Solution

The fourth proportional to 2,018.29, 2,787.36 and 1,390.45 is: 1,920.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,018.29 : 2,787.36 = 1,390.45 : x
  2. Step 2: Convert to fraction form
    2,018.29/2,787.36 = 1,390.45/x
  3. Step 3: Cross multiply
    2,018.29x = 2,787.36 × 1,390.45
  4. Step 4: Simplify right side
    2,018.29x = 3,875,684.71
  5. Step 5: Solve for x
    x = 3,875,684.71/2,018.29
  6. Step 6: Final answer
    x = 1,920.28

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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.