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Finding the Fourth Proportional to 128,888.52, 177,462 and 117,078.72

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Solution

The fourth proportional to 128,888.52, 177,462 and 117,078.72 is: 161,201.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,888.52 : 177,462 = 117,078.72 : x
  2. Step 2: Convert to fraction form
    128,888.52/177,462 = 117,078.72/x
  3. Step 3: Cross multiply
    128,888.52x = 177,462 × 117,078.72
  4. Step 4: Simplify right side
    128,888.52x = 20,777,023,808.64
  5. Step 5: Solve for x
    x = 20,777,023,808.64/128,888.52
  6. Step 6: Final answer
    x = 161,201.51

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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.