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Finding the Fourth Proportional to 221,428.60, 332,142.90 and 128,116.60

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Solution

The fourth proportional to 221,428.60, 332,142.90 and 128,116.60 is: 192,174.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    221,428.60 : 332,142.90 = 128,116.60 : x
  2. Step 2: Convert to fraction form
    221,428.60/332,142.90 = 128,116.60/x
  3. Step 3: Cross multiply
    221,428.60x = 332,142.90 × 128,116.60
  4. Step 4: Simplify right side
    221,428.60x = 42,553,019,062.14
  5. Step 5: Solve for x
    x = 42,553,019,062.14/221,428.60
  6. Step 6: Final answer
    x = 192,174.90

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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.