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Finding the Fourth Proportional to 139,633.11, 209,463.98 and 87,028.47

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Solution

The fourth proportional to 139,633.11, 209,463.98 and 87,028.47 is: 130,551.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,633.11 : 209,463.98 = 87,028.47 : x
  2. Step 2: Convert to fraction form
    139,633.11/209,463.98 = 87,028.47/x
  3. Step 3: Cross multiply
    139,633.11x = 209,463.98 × 87,028.47
  4. Step 4: Simplify right side
    139,633.11x = 18,229,329,264.37
  5. Step 5: Solve for x
    x = 18,229,329,264.37/139,633.11
  6. Step 6: Final answer
    x = 130,551.62

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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.