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Finding the Fourth Proportional to 81,998.40, 122,997.60 and 56,985.60

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Solution

The fourth proportional to 81,998.40, 122,997.60 and 56,985.60 is: 85,478.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,998.40 : 122,997.60 = 56,985.60 : x
  2. Step 2: Convert to fraction form
    81,998.40/122,997.60 = 56,985.60/x
  3. Step 3: Cross multiply
    81,998.40x = 122,997.60 × 56,985.60
  4. Step 4: Simplify right side
    81,998.40x = 7,009,092,034.56
  5. Step 5: Solve for x
    x = 7,009,092,034.56/81,998.40
  6. Step 6: Final answer
    x = 85,478.40

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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.