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Finding the Fourth Proportional to 1,040.70, 1,559.82 and 553.48

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Solution

The fourth proportional to 1,040.70, 1,559.82 and 553.48 is: 829.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,040.70 : 1,559.82 = 553.48 : x
  2. Step 2: Convert to fraction form
    1,040.70/1,559.82 = 553.48/x
  3. Step 3: Cross multiply
    1,040.70x = 1,559.82 × 553.48
  4. Step 4: Simplify right side
    1,040.70x = 863,329.17
  5. Step 5: Solve for x
    x = 863,329.17/1,040.70
  6. Step 6: Final answer
    x = 829.57

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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.