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Finding the Fourth Proportional to 66,789.92, 100,155.51 and 20,031.86

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Solution

The fourth proportional to 66,789.92, 100,155.51 and 20,031.86 is: 30,038.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    66,789.92 : 100,155.51 = 20,031.86 : x
  2. Step 2: Convert to fraction form
    66,789.92/100,155.51 = 20,031.86/x
  3. Step 3: Cross multiply
    66,789.92x = 100,155.51 × 20,031.86
  4. Step 4: Simplify right side
    66,789.92x = 2,006,300,653.77
  5. Step 5: Solve for x
    x = 2,006,300,653.77/66,789.92
  6. Step 6: Final answer
    x = 30,038.98

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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.