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Finding the Fourth Proportional to 131,438.40, 197,449.20 and 127,939.20

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Solution

The fourth proportional to 131,438.40, 197,449.20 and 127,939.20 is: 192,192.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    131,438.40 : 197,449.20 = 127,939.20 : x
  2. Step 2: Convert to fraction form
    131,438.40/197,449.20 = 127,939.20/x
  3. Step 3: Cross multiply
    131,438.40x = 197,449.20 × 127,939.20
  4. Step 4: Simplify right side
    131,438.40x = 25,261,492,688.64
  5. Step 5: Solve for x
    x = 25,261,492,688.64/131,438.40
  6. Step 6: Final answer
    x = 192,192.64

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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.