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Finding the Fourth Proportional to 85,985.01, 128,105.84 and 81,750.20

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Solution

The fourth proportional to 85,985.01, 128,105.84 and 81,750.20 is: 121,796.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,985.01 : 128,105.84 = 81,750.20 : x
  2. Step 2: Convert to fraction form
    85,985.01/128,105.84 = 81,750.20/x
  3. Step 3: Cross multiply
    85,985.01x = 128,105.84 × 81,750.20
  4. Step 4: Simplify right side
    85,985.01x = 10,472,677,605.01
  5. Step 5: Solve for x
    x = 10,472,677,605.01/85,985.01
  6. Step 6: Final answer
    x = 121,796.55

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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.