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Finding the Fourth Proportional to 128,585.08, 177,468.43 and 76,898.80

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Solution

The fourth proportional to 128,585.08, 177,468.43 and 76,898.80 is: 106,132.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,585.08 : 177,468.43 = 76,898.80 : x
  2. Step 2: Convert to fraction form
    128,585.08/177,468.43 = 76,898.80/x
  3. Step 3: Cross multiply
    128,585.08x = 177,468.43 × 76,898.80
  4. Step 4: Simplify right side
    128,585.08x = 13,647,109,304.88
  5. Step 5: Solve for x
    x = 13,647,109,304.88/128,585.08
  6. Step 6: Final answer
    x = 106,132.91

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1.5x scale

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.