Home / 1,540.20-2,127.06-1,187.40

Finding the Fourth Proportional to 1,540.20, 2,127.06 and 1,187.40

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Solution

The fourth proportional to 1,540.20, 2,127.06 and 1,187.40 is: 1,639.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,540.20 : 2,127.06 = 1,187.40 : x
  2. Step 2: Convert to fraction form
    1,540.20/2,127.06 = 1,187.40/x
  3. Step 3: Cross multiply
    1,540.20x = 2,127.06 × 1,187.40
  4. Step 4: Simplify right side
    1,540.20x = 2,525,671.04
  5. Step 5: Solve for x
    x = 2,525,671.04/1,540.20
  6. Step 6: Final answer
    x = 1,639.83

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1.5x scale

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.