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Finding the Fourth Proportional to 229,489, 316,692 and 128,887

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Solution

The fourth proportional to 229,489, 316,692 and 128,887 is: 177,862.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    229,489 : 316,692 = 128,887 : x
  2. Step 2: Convert to fraction form
    229,489/316,692 = 128,887/x
  3. Step 3: Cross multiply
    229,489x = 316,692 × 128,887
  4. Step 4: Simplify right side
    229,489x = 40,817,481,804
  5. Step 5: Solve for x
    x = 40,817,481,804/229,489
  6. Step 6: Final answer
    x = 177,862.48

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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.