Home / 1,947.20-2,920.78-486.34

Finding the Fourth Proportional to 1,947.20, 2,920.78 and 486.34

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Solution

The fourth proportional to 1,947.20, 2,920.78 and 486.34 is: 729.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,947.20 : 2,920.78 = 486.34 : x
  2. Step 2: Convert to fraction form
    1,947.20/2,920.78 = 486.34/x
  3. Step 3: Cross multiply
    1,947.20x = 2,920.78 × 486.34
  4. Step 4: Simplify right side
    1,947.20x = 1,420,492.15
  5. Step 5: Solve for x
    x = 1,420,492.15/1,947.20
  6. Step 6: Final answer
    x = 729.51

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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.