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Finding the Fourth Proportional to 85,511.80, 128,267.70 and 75,998.35

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Solution

The fourth proportional to 85,511.80, 128,267.70 and 75,998.35 is: 113,997.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,511.80 : 128,267.70 = 75,998.35 : x
  2. Step 2: Convert to fraction form
    85,511.80/128,267.70 = 75,998.35/x
  3. Step 3: Cross multiply
    85,511.80x = 128,267.70 × 75,998.35
  4. Step 4: Simplify right side
    85,511.80x = 9,748,133,558.30
  5. Step 5: Solve for x
    x = 9,748,133,558.30/85,511.80
  6. Step 6: Final answer
    x = 113,997.53

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Double scale
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Similar ratio
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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.