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Finding the Fourth Proportional to 1,040.74, 1,561.05 and 391.43

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Solution

The fourth proportional to 1,040.74, 1,561.05 and 391.43 is: 587.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,040.74 : 1,561.05 = 391.43 : x
  2. Step 2: Convert to fraction form
    1,040.74/1,561.05 = 391.43/x
  3. Step 3: Cross multiply
    1,040.74x = 1,561.05 × 391.43
  4. Step 4: Simplify right side
    1,040.74x = 611,041.80
  5. Step 5: Solve for x
    x = 611,041.80/1,040.74
  6. Step 6: Final answer
    x = 587.12

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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.