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Finding the Fourth Proportional to 61,211.60, 91,687.80 and 40,216.40

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Solution

The fourth proportional to 61,211.60, 91,687.80 and 40,216.40 is: 60,239.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    61,211.60 : 91,687.80 = 40,216.40 : x
  2. Step 2: Convert to fraction form
    61,211.60/91,687.80 = 40,216.40/x
  3. Step 3: Cross multiply
    61,211.60x = 91,687.80 × 40,216.40
  4. Step 4: Simplify right side
    61,211.60x = 3,687,353,239.92
  5. Step 5: Solve for x
    x = 3,687,353,239.92/61,211.60
  6. Step 6: Final answer
    x = 60,239.45

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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.