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Finding the Fourth Proportional to 61,125.71, 91,684.34 and 21,135.39

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Solution

The fourth proportional to 61,125.71, 91,684.34 and 21,135.39 is: 31,701.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    61,125.71 : 91,684.34 = 21,135.39 : x
  2. Step 2: Convert to fraction form
    61,125.71/91,684.34 = 21,135.39/x
  3. Step 3: Cross multiply
    61,125.71x = 91,684.34 × 21,135.39
  4. Step 4: Simplify right side
    61,125.71x = 1,937,784,222.54
  5. Step 5: Solve for x
    x = 1,937,784,222.54/61,125.71
  6. Step 6: Final answer
    x = 31,701.62

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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.