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Finding the Fourth Proportional to 139,620.95, 207,852.28 and 138,790.58

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Solution

The fourth proportional to 139,620.95, 207,852.28 and 138,790.58 is: 206,616.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,620.95 : 207,852.28 = 138,790.58 : x
  2. Step 2: Convert to fraction form
    139,620.95/207,852.28 = 138,790.58/x
  3. Step 3: Cross multiply
    139,620.95x = 207,852.28 × 138,790.58
  4. Step 4: Simplify right side
    139,620.95x = 28,847,938,495.52
  5. Step 5: Solve for x
    x = 28,847,938,495.52/139,620.95
  6. Step 6: Final answer
    x = 206,616.12

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.