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Finding the Fourth Proportional to 57,409.20, 85,870.80 and 51,528.60

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Solution

The fourth proportional to 57,409.20, 85,870.80 and 51,528.60 is: 77,074.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    57,409.20 : 85,870.80 = 51,528.60 : x
  2. Step 2: Convert to fraction form
    57,409.20/85,870.80 = 51,528.60/x
  3. Step 3: Cross multiply
    57,409.20x = 85,870.80 × 51,528.60
  4. Step 4: Simplify right side
    57,409.20x = 4,424,802,104.88
  5. Step 5: Solve for x
    x = 4,424,802,104.88/57,409.20
  6. Step 6: Final answer
    x = 77,074.79

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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.