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Finding the Fourth Proportional to 118,987.14, 164,191.86 and 67,989.72

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Solution

The fourth proportional to 118,987.14, 164,191.86 and 67,989.72 is: 93,819.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    118,987.14 : 164,191.86 = 67,989.72 : x
  2. Step 2: Convert to fraction form
    118,987.14/164,191.86 = 67,989.72/x
  3. Step 3: Cross multiply
    118,987.14x = 164,191.86 × 67,989.72
  4. Step 4: Simplify right side
    118,987.14x = 11,163,358,587.68
  5. Step 5: Solve for x
    x = 11,163,358,587.68/118,987.14
  6. Step 6: Final answer
    x = 93,819.87

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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.