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Finding the Fourth Proportional to 85,365.60, 128,153.70 and 53,775.60

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Solution

The fourth proportional to 85,365.60, 128,153.70 and 53,775.60 is: 80,729.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,365.60 : 128,153.70 = 53,775.60 : x
  2. Step 2: Convert to fraction form
    85,365.60/128,153.70 = 53,775.60/x
  3. Step 3: Cross multiply
    85,365.60x = 128,153.70 × 53,775.60
  4. Step 4: Simplify right side
    85,365.60x = 6,891,542,109.72
  5. Step 5: Solve for x
    x = 6,891,542,109.72/85,365.60
  6. Step 6: Final answer
    x = 80,729.73

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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.