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Finding the Fourth Proportional to 77,480.80, 116,221.20 and 21,320.80

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Solution

The fourth proportional to 77,480.80, 116,221.20 and 21,320.80 is: 31,981.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    77,480.80 : 116,221.20 = 21,320.80 : x
  2. Step 2: Convert to fraction form
    77,480.80/116,221.20 = 21,320.80/x
  3. Step 3: Cross multiply
    77,480.80x = 116,221.20 × 21,320.80
  4. Step 4: Simplify right side
    77,480.80x = 2,477,928,960.96
  5. Step 5: Solve for x
    x = 2,477,928,960.96/77,480.80
  6. Step 6: Final answer
    x = 31,981.20

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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.