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Finding the Fourth Proportional to 85,734.60, 128,601.90 and 54,241.80

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Solution

The fourth proportional to 85,734.60, 128,601.90 and 54,241.80 is: 81,362.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,734.60 : 128,601.90 = 54,241.80 : x
  2. Step 2: Convert to fraction form
    85,734.60/128,601.90 = 54,241.80/x
  3. Step 3: Cross multiply
    85,734.60x = 128,601.90 × 54,241.80
  4. Step 4: Simplify right side
    85,734.60x = 6,975,598,539.42
  5. Step 5: Solve for x
    x = 6,975,598,539.42/85,734.60
  6. Step 6: Final answer
    x = 81,362.70

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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.