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Finding the Fourth Proportional to 12,357, 18,535.50 and 3,123

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Solution

The fourth proportional to 12,357, 18,535.50 and 3,123 is: 4,684.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,357 : 18,535.50 = 3,123 : x
  2. Step 2: Convert to fraction form
    12,357/18,535.50 = 3,123/x
  3. Step 3: Cross multiply
    12,357x = 18,535.50 × 3,123
  4. Step 4: Simplify right side
    12,357x = 57,886,366.50
  5. Step 5: Solve for x
    x = 57,886,366.50/12,357
  6. Step 6: Final answer
    x = 4,684.50

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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.