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Finding the Fourth Proportional to 121,980.94, 168,410.10 and 78,391.17

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Solution

The fourth proportional to 121,980.94, 168,410.10 and 78,391.17 is: 108,228.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    121,980.94 : 168,410.10 = 78,391.17 : x
  2. Step 2: Convert to fraction form
    121,980.94/168,410.10 = 78,391.17/x
  3. Step 3: Cross multiply
    121,980.94x = 168,410.10 × 78,391.17
  4. Step 4: Simplify right side
    121,980.94x = 13,201,864,778.82
  5. Step 5: Solve for x
    x = 13,201,864,778.82/121,980.94
  6. Step 6: Final answer
    x = 108,228.92

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1.5x scale

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.