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Finding the Fourth Proportional to 1,040.19, 1,560.54 and 855.39

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Solution

The fourth proportional to 1,040.19, 1,560.54 and 855.39 is: 1,283.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,040.19 : 1,560.54 = 855.39 : x
  2. Step 2: Convert to fraction form
    1,040.19/1,560.54 = 855.39/x
  3. Step 3: Cross multiply
    1,040.19x = 1,560.54 × 855.39
  4. Step 4: Simplify right side
    1,040.19x = 1,334,874.21
  5. Step 5: Solve for x
    x = 1,334,874.21/1,040.19
  6. Step 6: Final answer
    x = 1,283.30

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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.