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Finding the Fourth Proportional to 878.06, 1,317.24 and 391.10

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Solution

The fourth proportional to 878.06, 1,317.24 and 391.10 is: 586.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    878.06 : 1,317.24 = 391.10 : x
  2. Step 2: Convert to fraction form
    878.06/1,317.24 = 391.10/x
  3. Step 3: Cross multiply
    878.06x = 1,317.24 × 391.10
  4. Step 4: Simplify right side
    878.06x = 515,172.56
  5. Step 5: Solve for x
    x = 515,172.56/878.06
  6. Step 6: Final answer
    x = 586.72

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These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.