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Finding the Fourth Proportional to 785.17, 1,176.96 and 438.67

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Solution

The fourth proportional to 785.17, 1,176.96 and 438.67 is: 657.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    785.17 : 1,176.96 = 438.67 : x
  2. Step 2: Convert to fraction form
    785.17/1,176.96 = 438.67/x
  3. Step 3: Cross multiply
    785.17x = 1,176.96 × 438.67
  4. Step 4: Simplify right side
    785.17x = 516,297.04
  5. Step 5: Solve for x
    x = 516,297.04/785.17
  6. Step 6: Final answer
    x = 657.56

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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.