Home / 100,664.12-138,904.98-80,513.66

Finding the Fourth Proportional to 100,664.12, 138,904.98 and 80,513.66

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Solution

The fourth proportional to 100,664.12, 138,904.98 and 80,513.66 is: 111,099.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    100,664.12 : 138,904.98 = 80,513.66 : x
  2. Step 2: Convert to fraction form
    100,664.12/138,904.98 = 80,513.66/x
  3. Step 3: Cross multiply
    100,664.12x = 138,904.98 × 80,513.66
  4. Step 4: Simplify right side
    100,664.12x = 11,183,748,332.03
  5. Step 5: Solve for x
    x = 11,183,748,332.03/100,664.12
  6. Step 6: Final answer
    x = 111,099.65

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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.