Home / 1,040.28-1,560.49-309.80

Finding the Fourth Proportional to 1,040.28, 1,560.49 and 309.80

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Solution

The fourth proportional to 1,040.28, 1,560.49 and 309.80 is: 464.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,040.28 : 1,560.49 = 309.80 : x
  2. Step 2: Convert to fraction form
    1,040.28/1,560.49 = 309.80/x
  3. Step 3: Cross multiply
    1,040.28x = 1,560.49 × 309.80
  4. Step 4: Simplify right side
    1,040.28x = 483,439.80
  5. Step 5: Solve for x
    x = 483,439.80/1,040.28
  6. Step 6: Final answer
    x = 464.72

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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.