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Finding the Fourth Proportional to 1,318.20, 1,976.76 and 1,264.20

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Solution

The fourth proportional to 1,318.20, 1,976.76 and 1,264.20 is: 1,895.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,318.20 : 1,976.76 = 1,264.20 : x
  2. Step 2: Convert to fraction form
    1,318.20/1,976.76 = 1,264.20/x
  3. Step 3: Cross multiply
    1,318.20x = 1,976.76 × 1,264.20
  4. Step 4: Simplify right side
    1,318.20x = 2,499,019.99
  5. Step 5: Solve for x
    x = 2,499,019.99/1,318.20
  6. Step 6: Final answer
    x = 1,895.78

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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.