Home / 81,155.20-121,732.80-53,161.60

Finding the Fourth Proportional to 81,155.20, 121,732.80 and 53,161.60

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Solution

The fourth proportional to 81,155.20, 121,732.80 and 53,161.60 is: 79,742.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,155.20 : 121,732.80 = 53,161.60 : x
  2. Step 2: Convert to fraction form
    81,155.20/121,732.80 = 53,161.60/x
  3. Step 3: Cross multiply
    81,155.20x = 121,732.80 × 53,161.60
  4. Step 4: Simplify right side
    81,155.20x = 6,471,510,420.48
  5. Step 5: Solve for x
    x = 6,471,510,420.48/81,155.20
  6. Step 6: Final answer
    x = 79,742.40

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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.