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Finding the Fourth Proportional to 121,843.72, 168,143.86 and 68,128.58

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Solution

The fourth proportional to 121,843.72, 168,143.86 and 68,128.58 is: 94,017.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    121,843.72 : 168,143.86 = 68,128.58 : x
  2. Step 2: Convert to fraction form
    121,843.72/168,143.86 = 68,128.58/x
  3. Step 3: Cross multiply
    121,843.72x = 168,143.86 × 68,128.58
  4. Step 4: Simplify right side
    121,843.72x = 11,455,402,417.52
  5. Step 5: Solve for x
    x = 11,455,402,417.52/121,843.72
  6. Step 6: Final answer
    x = 94,017.18

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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.