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Finding the Fourth Proportional to 128,665.64, 177,559 and 71,305.90

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Solution

The fourth proportional to 128,665.64, 177,559 and 71,305.90 is: 98,402.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,665.64 : 177,559 = 71,305.90 : x
  2. Step 2: Convert to fraction form
    128,665.64/177,559 = 71,305.90/x
  3. Step 3: Cross multiply
    128,665.64x = 177,559 × 71,305.90
  4. Step 4: Simplify right side
    128,665.64x = 12,661,004,298.10
  5. Step 5: Solve for x
    x = 12,661,004,298.10/128,665.64
  6. Step 6: Final answer
    x = 98,402.37

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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.