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Finding the Fourth Proportional to 61,148.70, 91,723.05 and 21,709.80

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Solution

The fourth proportional to 61,148.70, 91,723.05 and 21,709.80 is: 32,564.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    61,148.70 : 91,723.05 = 21,709.80 : x
  2. Step 2: Convert to fraction form
    61,148.70/91,723.05 = 21,709.80/x
  3. Step 3: Cross multiply
    61,148.70x = 91,723.05 × 21,709.80
  4. Step 4: Simplify right side
    61,148.70x = 1,991,289,070.89
  5. Step 5: Solve for x
    x = 1,991,289,070.89/61,148.70
  6. Step 6: Final answer
    x = 32,564.70

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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.