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Finding the Fourth Proportional to 1,040.93, 1,561.40 and 310.53

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Solution

The fourth proportional to 1,040.93, 1,561.40 and 310.53 is: 465.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,040.93 : 1,561.40 = 310.53 : x
  2. Step 2: Convert to fraction form
    1,040.93/1,561.40 = 310.53/x
  3. Step 3: Cross multiply
    1,040.93x = 1,561.40 × 310.53
  4. Step 4: Simplify right side
    1,040.93x = 484,867.88
  5. Step 5: Solve for x
    x = 484,867.88/1,040.93
  6. Step 6: Final answer
    x = 465.80

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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.