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Finding the Fourth Proportional to 121,743, 168,005.34 and 73,987.43

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Solution

The fourth proportional to 121,743, 168,005.34 and 73,987.43 is: 102,102.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    121,743 : 168,005.34 = 73,987.43 : x
  2. Step 2: Convert to fraction form
    121,743/168,005.34 = 73,987.43/x
  3. Step 3: Cross multiply
    121,743x = 168,005.34 × 73,987.43
  4. Step 4: Simplify right side
    121,743x = 12,430,282,492.85
  5. Step 5: Solve for x
    x = 12,430,282,492.85/121,743
  6. Step 6: Final answer
    x = 102,102.65

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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.