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Finding the Fourth Proportional to 128,836.90, 193,351.35 and 66,475.30

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Solution

The fourth proportional to 128,836.90, 193,351.35 and 66,475.30 is: 99,762.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,836.90 : 193,351.35 = 66,475.30 : x
  2. Step 2: Convert to fraction form
    128,836.90/193,351.35 = 66,475.30/x
  3. Step 3: Cross multiply
    128,836.90x = 193,351.35 × 66,475.30
  4. Step 4: Simplify right side
    128,836.90x = 12,853,088,996.66
  5. Step 5: Solve for x
    x = 12,853,088,996.66/128,836.90
  6. Step 6: Final answer
    x = 99,762.48

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.