Home / 5,286.12-7,929.65-1,390.50

Finding the Fourth Proportional to 5,286.12, 7,929.65 and 1,390.50

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Solution

The fourth proportional to 5,286.12, 7,929.65 and 1,390.50 is: 2,085.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    5,286.12 : 7,929.65 = 1,390.50 : x
  2. Step 2: Convert to fraction form
    5,286.12/7,929.65 = 1,390.50/x
  3. Step 3: Cross multiply
    5,286.12x = 7,929.65 × 1,390.50
  4. Step 4: Simplify right side
    5,286.12x = 11,026,171.37
  5. Step 5: Solve for x
    x = 11,026,171.37/5,286.12
  6. Step 6: Final answer
    x = 2,085.87

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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.