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Finding the Fourth Proportional to 85,539.60, 128,163.60 and 73,000.80

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Solution

The fourth proportional to 85,539.60, 128,163.60 and 73,000.80 is: 109,376.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,539.60 : 128,163.60 = 73,000.80 : x
  2. Step 2: Convert to fraction form
    85,539.60/128,163.60 = 73,000.80/x
  3. Step 3: Cross multiply
    85,539.60x = 128,163.60 × 73,000.80
  4. Step 4: Simplify right side
    85,539.60x = 9,356,045,330.88
  5. Step 5: Solve for x
    x = 9,356,045,330.88/85,539.60
  6. Step 6: Final answer
    x = 109,376.77

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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.