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Finding the Fourth Proportional to 785.78, 1,084.02 and 490.52

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Solution

The fourth proportional to 785.78, 1,084.02 and 490.52 is: 676.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    785.78 : 1,084.02 = 490.52 : x
  2. Step 2: Convert to fraction form
    785.78/1,084.02 = 490.52/x
  3. Step 3: Cross multiply
    785.78x = 1,084.02 × 490.52
  4. Step 4: Simplify right side
    785.78x = 531,733.49
  5. Step 5: Solve for x
    x = 531,733.49/785.78
  6. Step 6: Final answer
    x = 676.70

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.