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Finding the Fourth Proportional to 225,439.18, 311,103.10 and 128,640.74

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Solution

The fourth proportional to 225,439.18, 311,103.10 and 128,640.74 is: 177,522.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    225,439.18 : 311,103.10 = 128,640.74 : x
  2. Step 2: Convert to fraction form
    225,439.18/311,103.10 = 128,640.74/x
  3. Step 3: Cross multiply
    225,439.18x = 311,103.10 × 128,640.74
  4. Step 4: Simplify right side
    225,439.18x = 40,020,533,000.29
  5. Step 5: Solve for x
    x = 40,020,533,000.29/225,439.18
  6. Step 6: Final answer
    x = 177,522.53

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.