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Finding the Fourth Proportional to 139,969.70, 209,954.55 and 86,704.10

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Solution

The fourth proportional to 139,969.70, 209,954.55 and 86,704.10 is: 130,056.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,969.70 : 209,954.55 = 86,704.10 : x
  2. Step 2: Convert to fraction form
    139,969.70/209,954.55 = 86,704.10/x
  3. Step 3: Cross multiply
    139,969.70x = 209,954.55 × 86,704.10
  4. Step 4: Simplify right side
    139,969.70x = 18,203,920,298.66
  5. Step 5: Solve for x
    x = 18,203,920,298.66/139,969.70
  6. Step 6: Final answer
    x = 130,056.15

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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.