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Finding the Fourth Proportional to 57,619.20, 86,428.80 and 57,230.40

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Solution

The fourth proportional to 57,619.20, 86,428.80 and 57,230.40 is: 85,845.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    57,619.20 : 86,428.80 = 57,230.40 : x
  2. Step 2: Convert to fraction form
    57,619.20/86,428.80 = 57,230.40/x
  3. Step 3: Cross multiply
    57,619.20x = 86,428.80 × 57,230.40
  4. Step 4: Simplify right side
    57,619.20x = 4,946,354,795.52
  5. Step 5: Solve for x
    x = 4,946,354,795.52/57,619.20
  6. Step 6: Final answer
    x = 85,845.60

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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.