Home / 81,314.40-121,971.60-53,320.80

Finding the Fourth Proportional to 81,314.40, 121,971.60 and 53,320.80

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Solution

The fourth proportional to 81,314.40, 121,971.60 and 53,320.80 is: 79,981.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,314.40 : 121,971.60 = 53,320.80 : x
  2. Step 2: Convert to fraction form
    81,314.40/121,971.60 = 53,320.80/x
  3. Step 3: Cross multiply
    81,314.40x = 121,971.60 × 53,320.80
  4. Step 4: Simplify right side
    81,314.40x = 6,503,623,289.28
  5. Step 5: Solve for x
    x = 6,503,623,289.28/81,314.40
  6. Step 6: Final answer
    x = 79,981.20

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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.