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Finding the Fourth Proportional to 1,040.87, 1,561.19 and 310.45

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Solution

The fourth proportional to 1,040.87, 1,561.19 and 310.45 is: 465.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,040.87 : 1,561.19 = 310.45 : x
  2. Step 2: Convert to fraction form
    1,040.87/1,561.19 = 310.45/x
  3. Step 3: Cross multiply
    1,040.87x = 1,561.19 × 310.45
  4. Step 4: Simplify right side
    1,040.87x = 484,671.44
  5. Step 5: Solve for x
    x = 484,671.44/1,040.87
  6. Step 6: Final answer
    x = 465.64

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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.