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Finding the Fourth Proportional to 128,449.72, 192,644.34 and 72,314.20

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Solution

The fourth proportional to 128,449.72, 192,644.34 and 72,314.20 is: 108,454.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,449.72 : 192,644.34 = 72,314.20 : x
  2. Step 2: Convert to fraction form
    128,449.72/192,644.34 = 72,314.20/x
  3. Step 3: Cross multiply
    128,449.72x = 192,644.34 × 72,314.20
  4. Step 4: Simplify right side
    128,449.72x = 13,930,921,331.63
  5. Step 5: Solve for x
    x = 13,930,921,331.63/128,449.72
  6. Step 6: Final answer
    x = 108,454.28

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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.