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Finding the Fourth Proportional to 18,930.61, 28,393.94 and 8,400.81

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Solution

The fourth proportional to 18,930.61, 28,393.94 and 8,400.81 is: 12,600.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,930.61 : 28,393.94 = 8,400.81 : x
  2. Step 2: Convert to fraction form
    18,930.61/28,393.94 = 8,400.81/x
  3. Step 3: Cross multiply
    18,930.61x = 28,393.94 × 8,400.81
  4. Step 4: Simplify right side
    18,930.61x = 238,532,222.57
  5. Step 5: Solve for x
    x = 238,532,222.57/18,930.61
  6. Step 6: Final answer
    x = 12,600.34

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1.5x scale

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.