Home / 81,403.90-121,916.30-79,161.70

Finding the Fourth Proportional to 81,403.90, 121,916.30 and 79,161.70

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Solution

The fourth proportional to 81,403.90, 121,916.30 and 79,161.70 is: 118,558.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,403.90 : 121,916.30 = 79,161.70 : x
  2. Step 2: Convert to fraction form
    81,403.90/121,916.30 = 79,161.70/x
  3. Step 3: Cross multiply
    81,403.90x = 121,916.30 × 79,161.70
  4. Step 4: Simplify right side
    81,403.90x = 9,651,101,565.71
  5. Step 5: Solve for x
    x = 9,651,101,565.71/81,403.90
  6. Step 6: Final answer
    x = 118,558.22

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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.