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Finding the Fourth Proportional to 993.89, 1,370.62 and 639.45

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Solution

The fourth proportional to 993.89, 1,370.62 and 639.45 is: 881.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    993.89 : 1,370.62 = 639.45 : x
  2. Step 2: Convert to fraction form
    993.89/1,370.62 = 639.45/x
  3. Step 3: Cross multiply
    993.89x = 1,370.62 × 639.45
  4. Step 4: Simplify right side
    993.89x = 876,439.76
  5. Step 5: Solve for x
    x = 876,439.76/993.89
  6. Step 6: Final answer
    x = 881.83

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These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.