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Finding the Fourth Proportional to 128,668.20, 193,214.52 and 86,817.12

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Solution

The fourth proportional to 128,668.20, 193,214.52 and 86,817.12 is: 130,368.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,668.20 : 193,214.52 = 86,817.12 : x
  2. Step 2: Convert to fraction form
    128,668.20/193,214.52 = 86,817.12/x
  3. Step 3: Cross multiply
    128,668.20x = 193,214.52 × 86,817.12
  4. Step 4: Simplify right side
    128,668.20x = 16,774,328,168.58
  5. Step 5: Solve for x
    x = 16,774,328,168.58/128,668.20
  6. Step 6: Final answer
    x = 130,368.87

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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.