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Finding the Fourth Proportional to 61,209.40, 91,831.24 and 21,770.50

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Solution

The fourth proportional to 61,209.40, 91,831.24 and 21,770.50 is: 32,661.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    61,209.40 : 91,831.24 = 21,770.50 : x
  2. Step 2: Convert to fraction form
    61,209.40/91,831.24 = 21,770.50/x
  3. Step 3: Cross multiply
    61,209.40x = 91,831.24 × 21,770.50
  4. Step 4: Simplify right side
    61,209.40x = 1,999,212,010.42
  5. Step 5: Solve for x
    x = 1,999,212,010.42/61,209.40
  6. Step 6: Final answer
    x = 32,661.85

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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.