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Finding the Fourth Proportional to 225,772.96, 311,576.80 and 128,985.28

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Solution

The fourth proportional to 225,772.96, 311,576.80 and 128,985.28 is: 178,005.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    225,772.96 : 311,576.80 = 128,985.28 : x
  2. Step 2: Convert to fraction form
    225,772.96/311,576.80 = 128,985.28/x
  3. Step 3: Cross multiply
    225,772.96x = 311,576.80 × 128,985.28
  4. Step 4: Simplify right side
    225,772.96x = 40,188,820,789.50
  5. Step 5: Solve for x
    x = 40,188,820,789.50/225,772.96
  6. Step 6: Final answer
    x = 178,005.47

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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.