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Finding the Fourth Proportional to 723.69, 998.70 and 428.94

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Solution

The fourth proportional to 723.69, 998.70 and 428.94 is: 591.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    723.69 : 998.70 = 428.94 : x
  2. Step 2: Convert to fraction form
    723.69/998.70 = 428.94/x
  3. Step 3: Cross multiply
    723.69x = 998.70 × 428.94
  4. Step 4: Simplify right side
    723.69x = 428,382.38
  5. Step 5: Solve for x
    x = 428,382.38/723.69
  6. Step 6: Final answer
    x = 591.94

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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.