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Finding the Fourth Proportional to 878.80, 1,316.40 and 605.20

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Solution

The fourth proportional to 878.80, 1,316.40 and 605.20 is: 906.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    878.80 : 1,316.40 = 605.20 : x
  2. Step 2: Convert to fraction form
    878.80/1,316.40 = 605.20/x
  3. Step 3: Cross multiply
    878.80x = 1,316.40 × 605.20
  4. Step 4: Simplify right side
    878.80x = 796,685.28
  5. Step 5: Solve for x
    x = 796,685.28/878.80
  6. Step 6: Final answer
    x = 906.56

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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.