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Finding the Fourth Proportional to 1,040.90, 1,561.78 and 553.82

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Solution

The fourth proportional to 1,040.90, 1,561.78 and 553.82 is: 830.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,040.90 : 1,561.78 = 553.82 : x
  2. Step 2: Convert to fraction form
    1,040.90/1,561.78 = 553.82/x
  3. Step 3: Cross multiply
    1,040.90x = 1,561.78 × 553.82
  4. Step 4: Simplify right side
    1,040.90x = 864,945.00
  5. Step 5: Solve for x
    x = 864,945.00/1,040.90
  6. Step 6: Final answer
    x = 830.96

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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.