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Finding the Fourth Proportional to 139,639.70, 209,459.55 and 136,359.20

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Solution

The fourth proportional to 139,639.70, 209,459.55 and 136,359.20 is: 204,538.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,639.70 : 209,459.55 = 136,359.20 : x
  2. Step 2: Convert to fraction form
    139,639.70/209,459.55 = 136,359.20/x
  3. Step 3: Cross multiply
    139,639.70x = 209,459.55 × 136,359.20
  4. Step 4: Simplify right side
    139,639.70x = 28,561,736,670.36
  5. Step 5: Solve for x
    x = 28,561,736,670.36/139,639.70
  6. Step 6: Final answer
    x = 204,538.80

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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.