Home / 1,292.80-1,787.52-1,128.84

Finding the Fourth Proportional to 1,292.80, 1,787.52 and 1,128.84

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Solution

The fourth proportional to 1,292.80, 1,787.52 and 1,128.84 is: 1,560.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,292.80 : 1,787.52 = 1,128.84 : x
  2. Step 2: Convert to fraction form
    1,292.80/1,787.52 = 1,128.84/x
  3. Step 3: Cross multiply
    1,292.80x = 1,787.52 × 1,128.84
  4. Step 4: Simplify right side
    1,292.80x = 2,017,824.08
  5. Step 5: Solve for x
    x = 2,017,824.08/1,292.80
  6. Step 6: Final answer
    x = 1,560.82

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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.