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Finding the Fourth Proportional to 2,478.80, 3,718.46 and 919.22

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Solution

The fourth proportional to 2,478.80, 3,718.46 and 919.22 is: 1,378.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,478.80 : 3,718.46 = 919.22 : x
  2. Step 2: Convert to fraction form
    2,478.80/3,718.46 = 919.22/x
  3. Step 3: Cross multiply
    2,478.80x = 3,718.46 × 919.22
  4. Step 4: Simplify right side
    2,478.80x = 3,418,082.80
  5. Step 5: Solve for x
    x = 3,418,082.80/2,478.80
  6. Step 6: Final answer
    x = 1,378.93

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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.