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Finding the Fourth Proportional to 61,221.20, 91,831.80 and 19,672.40

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Solution

The fourth proportional to 61,221.20, 91,831.80 and 19,672.40 is: 29,508.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    61,221.20 : 91,831.80 = 19,672.40 : x
  2. Step 2: Convert to fraction form
    61,221.20/91,831.80 = 19,672.40/x
  3. Step 3: Cross multiply
    61,221.20x = 91,831.80 × 19,672.40
  4. Step 4: Simplify right side
    61,221.20x = 1,806,551,902.32
  5. Step 5: Solve for x
    x = 1,806,551,902.32/61,221.20
  6. Step 6: Final answer
    x = 29,508.60

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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.