Home / 1,389.96-2,073.60-1,280.61

Finding the Fourth Proportional to 1,389.96, 2,073.60 and 1,280.61

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Solution

The fourth proportional to 1,389.96, 2,073.60 and 1,280.61 is: 1,910.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,389.96 : 2,073.60 = 1,280.61 : x
  2. Step 2: Convert to fraction form
    1,389.96/2,073.60 = 1,280.61/x
  3. Step 3: Cross multiply
    1,389.96x = 2,073.60 × 1,280.61
  4. Step 4: Simplify right side
    1,389.96x = 2,655,472.90
  5. Step 5: Solve for x
    x = 2,655,472.90/1,389.96
  6. Step 6: Final answer
    x = 1,910.47

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.