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Finding the Fourth Proportional to 108,005.40, 161,489.70 and 80,011.80

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Solution

The fourth proportional to 108,005.40, 161,489.70 and 80,011.80 is: 119,633.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    108,005.40 : 161,489.70 = 80,011.80 : x
  2. Step 2: Convert to fraction form
    108,005.40/161,489.70 = 80,011.80/x
  3. Step 3: Cross multiply
    108,005.40x = 161,489.70 × 80,011.80
  4. Step 4: Simplify right side
    108,005.40x = 12,921,081,578.46
  5. Step 5: Solve for x
    x = 12,921,081,578.46/108,005.40
  6. Step 6: Final answer
    x = 119,633.66

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1.5x scale

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.