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Finding the Fourth Proportional to 1,399.50, 2,099.46 and 425.58

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Solution

The fourth proportional to 1,399.50, 2,099.46 and 425.58 is: 638.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,399.50 : 2,099.46 = 425.58 : x
  2. Step 2: Convert to fraction form
    1,399.50/2,099.46 = 425.58/x
  3. Step 3: Cross multiply
    1,399.50x = 2,099.46 × 425.58
  4. Step 4: Simplify right side
    1,399.50x = 893,488.19
  5. Step 5: Solve for x
    x = 893,488.19/1,399.50
  6. Step 6: Final answer
    x = 638.43

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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.