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Finding the Fourth Proportional to 128,743.20, 193,114.80 and 86,752.80

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Solution

The fourth proportional to 128,743.20, 193,114.80 and 86,752.80 is: 130,129.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,743.20 : 193,114.80 = 86,752.80 : x
  2. Step 2: Convert to fraction form
    128,743.20/193,114.80 = 86,752.80/x
  3. Step 3: Cross multiply
    128,743.20x = 193,114.80 × 86,752.80
  4. Step 4: Simplify right side
    128,743.20x = 16,753,249,621.44
  5. Step 5: Solve for x
    x = 16,753,249,621.44/128,743.20
  6. Step 6: Final answer
    x = 130,129.20

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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.