Home / 1,267.20-1,900.80-1,118.40

Finding the Fourth Proportional to 1,267.20, 1,900.80 and 1,118.40

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Solution

The fourth proportional to 1,267.20, 1,900.80 and 1,118.40 is: 1,677.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,267.20 : 1,900.80 = 1,118.40 : x
  2. Step 2: Convert to fraction form
    1,267.20/1,900.80 = 1,118.40/x
  3. Step 3: Cross multiply
    1,267.20x = 1,900.80 × 1,118.40
  4. Step 4: Simplify right side
    1,267.20x = 2,125,854.72
  5. Step 5: Solve for x
    x = 2,125,854.72/1,267.20
  6. Step 6: Final answer
    x = 1,677.60

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.