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Finding the Fourth Proportional to 223,580.64, 308,563.92 and 128,100

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Solution

The fourth proportional to 223,580.64, 308,563.92 and 128,100 is: 176,790.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    223,580.64 : 308,563.92 = 128,100 : x
  2. Step 2: Convert to fraction form
    223,580.64/308,563.92 = 128,100/x
  3. Step 3: Cross multiply
    223,580.64x = 308,563.92 × 128,100
  4. Step 4: Simplify right side
    223,580.64x = 39,527,038,152
  5. Step 5: Solve for x
    x = 39,527,038,152/223,580.64
  6. Step 6: Final answer
    x = 176,790.97

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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.