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Finding the Fourth Proportional to 85,999.70, 128,999.55 and 82,555.18

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Solution

The fourth proportional to 85,999.70, 128,999.55 and 82,555.18 is: 123,832.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,999.70 : 128,999.55 = 82,555.18 : x
  2. Step 2: Convert to fraction form
    85,999.70/128,999.55 = 82,555.18/x
  3. Step 3: Cross multiply
    85,999.70x = 128,999.55 × 82,555.18
  4. Step 4: Simplify right side
    85,999.70x = 10,649,580,425.17
  5. Step 5: Solve for x
    x = 10,649,580,425.17/85,999.70
  6. Step 6: Final answer
    x = 123,832.76

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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.