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Finding the Fourth Proportional to 878.19, 1,318.16 and 631.67

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Solution

The fourth proportional to 878.19, 1,318.16 and 631.67 is: 948.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    878.19 : 1,318.16 = 631.67 : x
  2. Step 2: Convert to fraction form
    878.19/1,318.16 = 631.67/x
  3. Step 3: Cross multiply
    878.19x = 1,318.16 × 631.67
  4. Step 4: Simplify right side
    878.19x = 832,633.56
  5. Step 5: Solve for x
    x = 832,633.56/878.19
  6. Step 6: Final answer
    x = 948.12

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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.