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Finding the Fourth Proportional to 91,220.96, 136,831.44 and 72,869.60

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Solution

The fourth proportional to 91,220.96, 136,831.44 and 72,869.60 is: 109,304.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    91,220.96 : 136,831.44 = 72,869.60 : x
  2. Step 2: Convert to fraction form
    91,220.96/136,831.44 = 72,869.60/x
  3. Step 3: Cross multiply
    91,220.96x = 136,831.44 × 72,869.60
  4. Step 4: Simplify right side
    91,220.96x = 9,970,852,300.22
  5. Step 5: Solve for x
    x = 9,970,852,300.22/91,220.96
  6. Step 6: Final answer
    x = 109,304.40

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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.