Home / 121,981.19-168,410.45-78,391.41

Finding the Fourth Proportional to 121,981.19, 168,410.45 and 78,391.41

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Solution

The fourth proportional to 121,981.19, 168,410.45 and 78,391.41 is: 108,229.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    121,981.19 : 168,410.45 = 78,391.41 : x
  2. Step 2: Convert to fraction form
    121,981.19/168,410.45 = 78,391.41/x
  3. Step 3: Cross multiply
    121,981.19x = 168,410.45 × 78,391.41
  4. Step 4: Simplify right side
    121,981.19x = 13,201,932,242.28
  5. Step 5: Solve for x
    x = 13,201,932,242.28/121,981.19
  6. Step 6: Final answer
    x = 108,229.25

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.