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Finding the Fourth Proportional to 878.07, 1,317.42 and 439.29

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Solution

The fourth proportional to 878.07, 1,317.42 and 439.29 is: 659.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    878.07 : 1,317.42 = 439.29 : x
  2. Step 2: Convert to fraction form
    878.07/1,317.42 = 439.29/x
  3. Step 3: Cross multiply
    878.07x = 1,317.42 × 439.29
  4. Step 4: Simplify right side
    878.07x = 578,729.43
  5. Step 5: Solve for x
    x = 578,729.43/878.07
  6. Step 6: Final answer
    x = 659.09

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1.5x scale

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.