Home / 1,679.30-2,518.55-691.85

Finding the Fourth Proportional to 1,679.30, 2,518.55 and 691.85

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Solution

The fourth proportional to 1,679.30, 2,518.55 and 691.85 is: 1,037.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,679.30 : 2,518.55 = 691.85 : x
  2. Step 2: Convert to fraction form
    1,679.30/2,518.55 = 691.85/x
  3. Step 3: Cross multiply
    1,679.30x = 2,518.55 × 691.85
  4. Step 4: Simplify right side
    1,679.30x = 1,742,442.77
  5. Step 5: Solve for x
    x = 1,742,442.77/1,679.30
  6. Step 6: Final answer
    x = 1,037.60

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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.