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Finding the Fourth Proportional to 61,139.60, 91,709.40 and 43,424.90

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Solution

The fourth proportional to 61,139.60, 91,709.40 and 43,424.90 is: 65,137.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    61,139.60 : 91,709.40 = 43,424.90 : x
  2. Step 2: Convert to fraction form
    61,139.60/91,709.40 = 43,424.90/x
  3. Step 3: Cross multiply
    61,139.60x = 91,709.40 × 43,424.90
  4. Step 4: Simplify right side
    61,139.60x = 3,982,471,524.06
  5. Step 5: Solve for x
    x = 3,982,471,524.06/61,139.60
  6. Step 6: Final answer
    x = 65,137.35

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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.