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Finding the Fourth Proportional to 128,391.60, 177,181.62 and 71,803.10

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Solution

The fourth proportional to 128,391.60, 177,181.62 and 71,803.10 is: 99,088.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,391.60 : 177,181.62 = 71,803.10 : x
  2. Step 2: Convert to fraction form
    128,391.60/177,181.62 = 71,803.10/x
  3. Step 3: Cross multiply
    128,391.60x = 177,181.62 × 71,803.10
  4. Step 4: Simplify right side
    128,391.60x = 12,722,189,579.02
  5. Step 5: Solve for x
    x = 12,722,189,579.02/128,391.60
  6. Step 6: Final answer
    x = 99,088.96

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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.