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Finding the Fourth Proportional to 785.12, 1,177.68 and 298.58

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Solution

The fourth proportional to 785.12, 1,177.68 and 298.58 is: 447.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    785.12 : 1,177.68 = 298.58 : x
  2. Step 2: Convert to fraction form
    785.12/1,177.68 = 298.58/x
  3. Step 3: Cross multiply
    785.12x = 1,177.68 × 298.58
  4. Step 4: Simplify right side
    785.12x = 351,631.69
  5. Step 5: Solve for x
    x = 351,631.69/785.12
  6. Step 6: Final answer
    x = 447.87

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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.