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Finding the Fourth Proportional to 121,989.60, 168,339.60 and 68,274.72

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Solution

The fourth proportional to 121,989.60, 168,339.60 and 68,274.72 is: 94,215.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    121,989.60 : 168,339.60 = 68,274.72 : x
  2. Step 2: Convert to fraction form
    121,989.60/168,339.60 = 68,274.72/x
  3. Step 3: Cross multiply
    121,989.60x = 168,339.60 × 68,274.72
  4. Step 4: Simplify right side
    121,989.60x = 11,493,339,054.91
  5. Step 5: Solve for x
    x = 11,493,339,054.91/121,989.60
  6. Step 6: Final answer
    x = 94,215.73

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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.