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Finding the Fourth Proportional to 713.78, 984.65 and 492.85

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Solution

The fourth proportional to 713.78, 984.65 and 492.85 is: 679.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    713.78 : 984.65 = 492.85 : x
  2. Step 2: Convert to fraction form
    713.78/984.65 = 492.85/x
  3. Step 3: Cross multiply
    713.78x = 984.65 × 492.85
  4. Step 4: Simplify right side
    713.78x = 485,284.75
  5. Step 5: Solve for x
    x = 485,284.75/713.78
  6. Step 6: Final answer
    x = 679.88

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1.5x scale

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.