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Finding the Fourth Proportional to 61,125.60, 91,704.60 and 21,678.60

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Solution

The fourth proportional to 61,125.60, 91,704.60 and 21,678.60 is: 32,523.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    61,125.60 : 91,704.60 = 21,678.60 : x
  2. Step 2: Convert to fraction form
    61,125.60/91,704.60 = 21,678.60/x
  3. Step 3: Cross multiply
    61,125.60x = 91,704.60 × 21,678.60
  4. Step 4: Simplify right side
    61,125.60x = 1,988,027,341.56
  5. Step 5: Solve for x
    x = 1,988,027,341.56/61,125.60
  6. Step 6: Final answer
    x = 32,523.65

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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.