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Finding the Fourth Proportional to 100,651.78, 138,899.90 and 55,332.67

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Solution

The fourth proportional to 100,651.78, 138,899.90 and 55,332.67 is: 76,359.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    100,651.78 : 138,899.90 = 55,332.67 : x
  2. Step 2: Convert to fraction form
    100,651.78/138,899.90 = 55,332.67/x
  3. Step 3: Cross multiply
    100,651.78x = 138,899.90 × 55,332.67
  4. Step 4: Simplify right side
    100,651.78x = 7,685,702,329.73
  5. Step 5: Solve for x
    x = 7,685,702,329.73/100,651.78
  6. Step 6: Final answer
    x = 76,359.33

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.