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Finding the Fourth Proportional to 85,910.76, 128,168.65 and 81,260.66

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Solution

The fourth proportional to 85,910.76, 128,168.65 and 81,260.66 is: 121,231.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,910.76 : 128,168.65 = 81,260.66 : x
  2. Step 2: Convert to fraction form
    85,910.76/128,168.65 = 81,260.66/x
  3. Step 3: Cross multiply
    85,910.76x = 128,168.65 × 81,260.66
  4. Step 4: Simplify right side
    85,910.76x = 10,415,069,090.31
  5. Step 5: Solve for x
    x = 10,415,069,090.31/85,910.76
  6. Step 6: Final answer
    x = 121,231.25

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.