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Finding the Fourth Proportional to 139,074.18, 209,653.64 and 129,805.01

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Solution

The fourth proportional to 139,074.18, 209,653.64 and 129,805.01 is: 195,680.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,074.18 : 209,653.64 = 129,805.01 : x
  2. Step 2: Convert to fraction form
    139,074.18/209,653.64 = 129,805.01/x
  3. Step 3: Cross multiply
    139,074.18x = 209,653.64 × 129,805.01
  4. Step 4: Simplify right side
    139,074.18x = 27,214,092,187.84
  5. Step 5: Solve for x
    x = 27,214,092,187.84/139,074.18
  6. Step 6: Final answer
    x = 195,680.40

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.