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Finding the Fourth Proportional to 85,998.20, 128,705.70 and 75,500.60

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Solution

The fourth proportional to 85,998.20, 128,705.70 and 75,500.60 is: 112,994.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,998.20 : 128,705.70 = 75,500.60 : x
  2. Step 2: Convert to fraction form
    85,998.20/128,705.70 = 75,500.60/x
  3. Step 3: Cross multiply
    85,998.20x = 128,705.70 × 75,500.60
  4. Step 4: Simplify right side
    85,998.20x = 9,717,357,573.42
  5. Step 5: Solve for x
    x = 9,717,357,573.42/85,998.20
  6. Step 6: Final answer
    x = 112,994.89

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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.