Home / 1,227.92-1,690.20-1,111.28

Finding the Fourth Proportional to 1,227.92, 1,690.20 and 1,111.28

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Solution

The fourth proportional to 1,227.92, 1,690.20 and 1,111.28 is: 1,529.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,227.92 : 1,690.20 = 1,111.28 : x
  2. Step 2: Convert to fraction form
    1,227.92/1,690.20 = 1,111.28/x
  3. Step 3: Cross multiply
    1,227.92x = 1,690.20 × 1,111.28
  4. Step 4: Simplify right side
    1,227.92x = 1,878,285.46
  5. Step 5: Solve for x
    x = 1,878,285.46/1,227.92
  6. Step 6: Final answer
    x = 1,529.65

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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.