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Finding the Fourth Proportional to 78,289.52, 117,431.84 and 19,125.52

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Solution

The fourth proportional to 78,289.52, 117,431.84 and 19,125.52 is: 28,687.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,289.52 : 117,431.84 = 19,125.52 : x
  2. Step 2: Convert to fraction form
    78,289.52/117,431.84 = 19,125.52/x
  3. Step 3: Cross multiply
    78,289.52x = 117,431.84 × 19,125.52
  4. Step 4: Simplify right side
    78,289.52x = 2,245,945,004.56
  5. Step 5: Solve for x
    x = 2,245,945,004.56/78,289.52
  6. Step 6: Final answer
    x = 28,687.68

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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.