Home / 1,905.12-2,856.40-979.52

Finding the Fourth Proportional to 1,905.12, 2,856.40 and 979.52

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Solution

The fourth proportional to 1,905.12, 2,856.40 and 979.52 is: 1,468.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,905.12 : 2,856.40 = 979.52 : x
  2. Step 2: Convert to fraction form
    1,905.12/2,856.40 = 979.52/x
  3. Step 3: Cross multiply
    1,905.12x = 2,856.40 × 979.52
  4. Step 4: Simplify right side
    1,905.12x = 2,797,900.93
  5. Step 5: Solve for x
    x = 2,797,900.93/1,905.12
  6. Step 6: Final answer
    x = 1,468.62

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1.5x scale

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.