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Finding the Fourth Proportional to 203,981.60, 306,037.20 and 91,618.40

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Solution

The fourth proportional to 203,981.60, 306,037.20 and 91,618.40 is: 137,456.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    203,981.60 : 306,037.20 = 91,618.40 : x
  2. Step 2: Convert to fraction form
    203,981.60/306,037.20 = 91,618.40/x
  3. Step 3: Cross multiply
    203,981.60x = 306,037.20 × 91,618.40
  4. Step 4: Simplify right side
    203,981.60x = 28,038,638,604.48
  5. Step 5: Solve for x
    x = 28,038,638,604.48/203,981.60
  6. Step 6: Final answer
    x = 137,456.70

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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.