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Finding the Fourth Proportional to 128,616.51, 177,490.80 and 72,027.88

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Solution

The fourth proportional to 128,616.51, 177,490.80 and 72,027.88 is: 99,398.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,616.51 : 177,490.80 = 72,027.88 : x
  2. Step 2: Convert to fraction form
    128,616.51/177,490.80 = 72,027.88/x
  3. Step 3: Cross multiply
    128,616.51x = 177,490.80 × 72,027.88
  4. Step 4: Simplify right side
    128,616.51x = 12,784,286,043.50
  5. Step 5: Solve for x
    x = 12,784,286,043.50/128,616.51
  6. Step 6: Final answer
    x = 99,398.48

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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.