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Finding the Fourth Proportional to 879.75, 1,319.90 and 393.08

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Solution

The fourth proportional to 879.75, 1,319.90 and 393.08 is: 589.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    879.75 : 1,319.90 = 393.08 : x
  2. Step 2: Convert to fraction form
    879.75/1,319.90 = 393.08/x
  3. Step 3: Cross multiply
    879.75x = 1,319.90 × 393.08
  4. Step 4: Simplify right side
    879.75x = 518,817.73
  5. Step 5: Solve for x
    x = 518,817.73/879.75
  6. Step 6: Final answer
    x = 589.73

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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.