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Finding the Fourth Proportional to 305,999.70, 458,999.55 and 128,447.70

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Solution

The fourth proportional to 305,999.70, 458,999.55 and 128,447.70 is: 192,671.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    305,999.70 : 458,999.55 = 128,447.70 : x
  2. Step 2: Convert to fraction form
    305,999.70/458,999.55 = 128,447.70/x
  3. Step 3: Cross multiply
    305,999.70x = 458,999.55 × 128,447.70
  4. Step 4: Simplify right side
    305,999.70x = 58,957,436,498.54
  5. Step 5: Solve for x
    x = 58,957,436,498.54/305,999.70
  6. Step 6: Final answer
    x = 192,671.55

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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.