Home / 1,421.72-2,130.66-1,074.78

Finding the Fourth Proportional to 1,421.72, 2,130.66 and 1,074.78

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Solution

The fourth proportional to 1,421.72, 2,130.66 and 1,074.78 is: 1,610.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,421.72 : 2,130.66 = 1,074.78 : x
  2. Step 2: Convert to fraction form
    1,421.72/2,130.66 = 1,074.78/x
  3. Step 3: Cross multiply
    1,421.72x = 2,130.66 × 1,074.78
  4. Step 4: Simplify right side
    1,421.72x = 2,289,990.75
  5. Step 5: Solve for x
    x = 2,289,990.75/1,421.72
  6. Step 6: Final answer
    x = 1,610.72

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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.