Home / 1,426.20-2,140.40-990.51

Finding the Fourth Proportional to 1,426.20, 2,140.40 and 990.51

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Solution

The fourth proportional to 1,426.20, 2,140.40 and 990.51 is: 1,486.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,426.20 : 2,140.40 = 990.51 : x
  2. Step 2: Convert to fraction form
    1,426.20/2,140.40 = 990.51/x
  3. Step 3: Cross multiply
    1,426.20x = 2,140.40 × 990.51
  4. Step 4: Simplify right side
    1,426.20x = 2,120,082.65
  5. Step 5: Solve for x
    x = 2,120,082.65/1,426.20
  6. Step 6: Final answer
    x = 1,486.53

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1.5x scale

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.