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Finding the Fourth Proportional to 229,991.88, 317,388.75 and 128,015.15

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Solution

The fourth proportional to 229,991.88, 317,388.75 and 128,015.15 is: 176,660.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    229,991.88 : 317,388.75 = 128,015.15 : x
  2. Step 2: Convert to fraction form
    229,991.88/317,388.75 = 128,015.15/x
  3. Step 3: Cross multiply
    229,991.88x = 317,388.75 × 128,015.15
  4. Step 4: Simplify right side
    229,991.88x = 40,630,567,899.02
  5. Step 5: Solve for x
    x = 40,630,567,899.02/229,991.88
  6. Step 6: Final answer
    x = 176,660.88

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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.