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Finding the Fourth Proportional to 86,402.63, 129,603.94 and 20,738.63

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Solution

The fourth proportional to 86,402.63, 129,603.94 and 20,738.63 is: 31,107.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    86,402.63 : 129,603.94 = 20,738.63 : x
  2. Step 2: Convert to fraction form
    86,402.63/129,603.94 = 20,738.63/x
  3. Step 3: Cross multiply
    86,402.63x = 129,603.94 × 20,738.63
  4. Step 4: Simplify right side
    86,402.63x = 2,687,807,458.34
  5. Step 5: Solve for x
    x = 2,687,807,458.34/86,402.63
  6. Step 6: Final answer
    x = 31,107.94

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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.