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Finding the Fourth Proportional to 61,009.74, 91,517.85 and 18,918.90

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Solution

The fourth proportional to 61,009.74, 91,517.85 and 18,918.90 is: 28,379.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    61,009.74 : 91,517.85 = 18,918.90 : x
  2. Step 2: Convert to fraction form
    61,009.74/91,517.85 = 18,918.90/x
  3. Step 3: Cross multiply
    61,009.74x = 91,517.85 × 18,918.90
  4. Step 4: Simplify right side
    61,009.74x = 1,731,417,052.37
  5. Step 5: Solve for x
    x = 1,731,417,052.37/61,009.74
  6. Step 6: Final answer
    x = 28,379.35

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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.