Home / 1,320.20-1,979.76-1,266.20

Finding the Fourth Proportional to 1,320.20, 1,979.76 and 1,266.20

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Solution

The fourth proportional to 1,320.20, 1,979.76 and 1,266.20 is: 1,898.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,320.20 : 1,979.76 = 1,266.20 : x
  2. Step 2: Convert to fraction form
    1,320.20/1,979.76 = 1,266.20/x
  3. Step 3: Cross multiply
    1,320.20x = 1,979.76 × 1,266.20
  4. Step 4: Simplify right side
    1,320.20x = 2,506,772.11
  5. Step 5: Solve for x
    x = 2,506,772.11/1,320.20
  6. Step 6: Final answer
    x = 1,898.78

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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.