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Finding the Fourth Proportional to 91,100.80, 136,420.80 and 72,668.80

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Solution

The fourth proportional to 91,100.80, 136,420.80 and 72,668.80 is: 108,819.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    91,100.80 : 136,420.80 = 72,668.80 : x
  2. Step 2: Convert to fraction form
    91,100.80/136,420.80 = 72,668.80/x
  3. Step 3: Cross multiply
    91,100.80x = 136,420.80 × 72,668.80
  4. Step 4: Simplify right side
    91,100.80x = 9,913,535,831.04
  5. Step 5: Solve for x
    x = 9,913,535,831.04/91,100.80
  6. Step 6: Final answer
    x = 108,819.42

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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.