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Finding the Fourth Proportional to 268,640.40, 402,499.80 and 128,096.40

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Solution

The fourth proportional to 268,640.40, 402,499.80 and 128,096.40 is: 191,924.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    268,640.40 : 402,499.80 = 128,096.40 : x
  2. Step 2: Convert to fraction form
    268,640.40/402,499.80 = 128,096.40/x
  3. Step 3: Cross multiply
    268,640.40x = 402,499.80 × 128,096.40
  4. Step 4: Simplify right side
    268,640.40x = 51,558,775,380.72
  5. Step 5: Solve for x
    x = 51,558,775,380.72/268,640.40
  6. Step 6: Final answer
    x = 191,924.88

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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.