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Finding the Fourth Proportional to 1,040.56, 1,560.90 and 391.24

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Solution

The fourth proportional to 1,040.56, 1,560.90 and 391.24 is: 586.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,040.56 : 1,560.90 = 391.24 : x
  2. Step 2: Convert to fraction form
    1,040.56/1,560.90 = 391.24/x
  3. Step 3: Cross multiply
    1,040.56x = 1,560.90 × 391.24
  4. Step 4: Simplify right side
    1,040.56x = 610,686.52
  5. Step 5: Solve for x
    x = 610,686.52/1,040.56
  6. Step 6: Final answer
    x = 586.88

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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.