Home / 1,421.05-2,120.47-1,125.20

Finding the Fourth Proportional to 1,421.05, 2,120.47 and 1,125.20

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Solution

The fourth proportional to 1,421.05, 2,120.47 and 1,125.20 is: 1,679.00

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,421.05 : 2,120.47 = 1,125.20 : x
  2. Step 2: Convert to fraction form
    1,421.05/2,120.47 = 1,125.20/x
  3. Step 3: Cross multiply
    1,421.05x = 2,120.47 × 1,125.20
  4. Step 4: Simplify right side
    1,421.05x = 2,385,942.24
  5. Step 5: Solve for x
    x = 2,385,942.24/1,421.05
  6. Step 6: Final answer
    x = 1,679.00

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.