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Finding the Fourth Proportional to 139,930.77, 209,916.90 and 45,129.78

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Solution

The fourth proportional to 139,930.77, 209,916.90 and 45,129.78 is: 67,701.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,930.77 : 209,916.90 = 45,129.78 : x
  2. Step 2: Convert to fraction form
    139,930.77/209,916.90 = 45,129.78/x
  3. Step 3: Cross multiply
    139,930.77x = 209,916.90 × 45,129.78
  4. Step 4: Simplify right side
    139,930.77x = 9,473,503,515.28
  5. Step 5: Solve for x
    x = 9,473,503,515.28/139,930.77
  6. Step 6: Final answer
    x = 67,701.36

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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.