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Finding the Fourth Proportional to 61,134.55, 91,679.45 and 21,143.43

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Solution

The fourth proportional to 61,134.55, 91,679.45 and 21,143.43 is: 31,707.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    61,134.55 : 91,679.45 = 21,143.43 : x
  2. Step 2: Convert to fraction form
    61,134.55/91,679.45 = 21,143.43/x
  3. Step 3: Cross multiply
    61,134.55x = 91,679.45 × 21,143.43
  4. Step 4: Simplify right side
    61,134.55x = 1,938,417,927.80
  5. Step 5: Solve for x
    x = 1,938,417,927.80/61,134.55
  6. Step 6: Final answer
    x = 31,707.41

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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.