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Finding the Fourth Proportional to 223,609.78, 308,576.49 and 128,172.70

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Solution

The fourth proportional to 223,609.78, 308,576.49 and 128,172.70 is: 176,875.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    223,609.78 : 308,576.49 = 128,172.70 : x
  2. Step 2: Convert to fraction form
    223,609.78/308,576.49 = 128,172.70/x
  3. Step 3: Cross multiply
    223,609.78x = 308,576.49 × 128,172.70
  4. Step 4: Simplify right side
    223,609.78x = 39,551,081,879.82
  5. Step 5: Solve for x
    x = 39,551,081,879.82/223,609.78
  6. Step 6: Final answer
    x = 176,875.46

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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.