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Finding the Fourth Proportional to 140,305.90, 210,457.41 and 81,103.90

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Solution

The fourth proportional to 140,305.90, 210,457.41 and 81,103.90 is: 121,655.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    140,305.90 : 210,457.41 = 81,103.90 : x
  2. Step 2: Convert to fraction form
    140,305.90/210,457.41 = 81,103.90/x
  3. Step 3: Cross multiply
    140,305.90x = 210,457.41 × 81,103.90
  4. Step 4: Simplify right side
    140,305.90x = 17,068,916,734.90
  5. Step 5: Solve for x
    x = 17,068,916,734.90/140,305.90
  6. Step 6: Final answer
    x = 121,655.02

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.