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Finding the Fourth Proportional to 18,972, 28,458 and 5,121

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Solution

The fourth proportional to 18,972, 28,458 and 5,121 is: 7,681.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,972 : 28,458 = 5,121 : x
  2. Step 2: Convert to fraction form
    18,972/28,458 = 5,121/x
  3. Step 3: Cross multiply
    18,972x = 28,458 × 5,121
  4. Step 4: Simplify right side
    18,972x = 145,733,418
  5. Step 5: Solve for x
    x = 145,733,418/18,972
  6. Step 6: Final answer
    x = 7,681.50

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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.