Home / 1,288.36-1,772.58-1,113.40

Finding the Fourth Proportional to 1,288.36, 1,772.58 and 1,113.40

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Solution

The fourth proportional to 1,288.36, 1,772.58 and 1,113.40 is: 1,531.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,288.36 : 1,772.58 = 1,113.40 : x
  2. Step 2: Convert to fraction form
    1,288.36/1,772.58 = 1,113.40/x
  3. Step 3: Cross multiply
    1,288.36x = 1,772.58 × 1,113.40
  4. Step 4: Simplify right side
    1,288.36x = 1,973,590.57
  5. Step 5: Solve for x
    x = 1,973,590.57/1,288.36
  6. Step 6: Final answer
    x = 1,531.86

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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.