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Finding the Fourth Proportional to 878.64, 1,318.16 and 293.68

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Solution

The fourth proportional to 878.64, 1,318.16 and 293.68 is: 440.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    878.64 : 1,318.16 = 293.68 : x
  2. Step 2: Convert to fraction form
    878.64/1,318.16 = 293.68/x
  3. Step 3: Cross multiply
    878.64x = 1,318.16 × 293.68
  4. Step 4: Simplify right side
    878.64x = 387,117.23
  5. Step 5: Solve for x
    x = 387,117.23/878.64
  6. Step 6: Final answer
    x = 440.59

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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.