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Finding the Fourth Proportional to 879.57, 1,319.37 and 554.25

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Solution

The fourth proportional to 879.57, 1,319.37 and 554.25 is: 831.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    879.57 : 1,319.37 = 554.25 : x
  2. Step 2: Convert to fraction form
    879.57/1,319.37 = 554.25/x
  3. Step 3: Cross multiply
    879.57x = 1,319.37 × 554.25
  4. Step 4: Simplify right side
    879.57x = 731,260.82
  5. Step 5: Solve for x
    x = 731,260.82/879.57
  6. Step 6: Final answer
    x = 831.38

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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.