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Finding the Fourth Proportional to 878.65, 1,317.15 and 331.20

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Solution

The fourth proportional to 878.65, 1,317.15 and 331.20 is: 496.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    878.65 : 1,317.15 = 331.20 : x
  2. Step 2: Convert to fraction form
    878.65/1,317.15 = 331.20/x
  3. Step 3: Cross multiply
    878.65x = 1,317.15 × 331.20
  4. Step 4: Simplify right side
    878.65x = 436,240.08
  5. Step 5: Solve for x
    x = 436,240.08/878.65
  6. Step 6: Final answer
    x = 496.49

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Half scale
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Double scale
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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.