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Finding the Fourth Proportional to 785.56, 1,179.05 and 438.39

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Solution

The fourth proportional to 785.56, 1,179.05 and 438.39 is: 657.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    785.56 : 1,179.05 = 438.39 : x
  2. Step 2: Convert to fraction form
    785.56/1,179.05 = 438.39/x
  3. Step 3: Cross multiply
    785.56x = 1,179.05 × 438.39
  4. Step 4: Simplify right side
    785.56x = 516,875.64
  5. Step 5: Solve for x
    x = 516,875.64/785.56
  6. Step 6: Final answer
    x = 657.97

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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.