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Finding the Fourth Proportional to 85,997.70, 128,996.55 and 76,812.30

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Solution

The fourth proportional to 85,997.70, 128,996.55 and 76,812.30 is: 115,218.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,997.70 : 128,996.55 = 76,812.30 : x
  2. Step 2: Convert to fraction form
    85,997.70/128,996.55 = 76,812.30/x
  3. Step 3: Cross multiply
    85,997.70x = 128,996.55 × 76,812.30
  4. Step 4: Simplify right side
    85,997.70x = 9,908,521,697.57
  5. Step 5: Solve for x
    x = 9,908,521,697.57/85,997.70
  6. Step 6: Final answer
    x = 115,218.45

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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.