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Finding the Fourth Proportional to 139,921.33, 209,911.88 and 45,156.91

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Solution

The fourth proportional to 139,921.33, 209,911.88 and 45,156.91 is: 67,745.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,921.33 : 209,911.88 = 45,156.91 : x
  2. Step 2: Convert to fraction form
    139,921.33/209,911.88 = 45,156.91/x
  3. Step 3: Cross multiply
    139,921.33x = 209,911.88 × 45,156.91
  4. Step 4: Simplify right side
    139,921.33x = 9,478,971,873.09
  5. Step 5: Solve for x
    x = 9,478,971,873.09/139,921.33
  6. Step 6: Final answer
    x = 67,745.01

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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.