Home / 1,490.40-2,047.20-1,227.84

Finding the Fourth Proportional to 1,490.40, 2,047.20 and 1,227.84

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Solution

The fourth proportional to 1,490.40, 2,047.20 and 1,227.84 is: 1,686.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,490.40 : 2,047.20 = 1,227.84 : x
  2. Step 2: Convert to fraction form
    1,490.40/2,047.20 = 1,227.84/x
  3. Step 3: Cross multiply
    1,490.40x = 2,047.20 × 1,227.84
  4. Step 4: Simplify right side
    1,490.40x = 2,513,634.05
  5. Step 5: Solve for x
    x = 2,513,634.05/1,490.40
  6. Step 6: Final answer
    x = 1,686.55

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.