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Finding the Fourth Proportional to 1,040.40, 1,558.62 and 553.68

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Solution

The fourth proportional to 1,040.40, 1,558.62 and 553.68 is: 829.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,040.40 : 1,558.62 = 553.68 : x
  2. Step 2: Convert to fraction form
    1,040.40/1,558.62 = 553.68/x
  3. Step 3: Cross multiply
    1,040.40x = 1,558.62 × 553.68
  4. Step 4: Simplify right side
    1,040.40x = 862,976.72
  5. Step 5: Solve for x
    x = 862,976.72/1,040.40
  6. Step 6: Final answer
    x = 829.47

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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.