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Finding the Fourth Proportional to 1,040.39, 1,560.11 and 390.66

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Solution

The fourth proportional to 1,040.39, 1,560.11 and 390.66 is: 585.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,040.39 : 1,560.11 = 390.66 : x
  2. Step 2: Convert to fraction form
    1,040.39/1,560.11 = 390.66/x
  3. Step 3: Cross multiply
    1,040.39x = 1,560.11 × 390.66
  4. Step 4: Simplify right side
    1,040.39x = 609,472.57
  5. Step 5: Solve for x
    x = 609,472.57/1,040.39
  6. Step 6: Final answer
    x = 585.81

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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.