Home / 1,420.08-2,125.72-769.20

Finding the Fourth Proportional to 1,420.08, 2,125.72 and 769.20

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Solution

The fourth proportional to 1,420.08, 2,125.72 and 769.20 is: 1,151.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,420.08 : 2,125.72 = 769.20 : x
  2. Step 2: Convert to fraction form
    1,420.08/2,125.72 = 769.20/x
  3. Step 3: Cross multiply
    1,420.08x = 2,125.72 × 769.20
  4. Step 4: Simplify right side
    1,420.08x = 1,635,103.82
  5. Step 5: Solve for x
    x = 1,635,103.82/1,420.08
  6. Step 6: Final answer
    x = 1,151.42

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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.