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Finding the Fourth Proportional to 128,616.14, 177,490.29 and 72,027.51

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Solution

The fourth proportional to 128,616.14, 177,490.29 and 72,027.51 is: 99,397.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,616.14 : 177,490.29 = 72,027.51 : x
  2. Step 2: Convert to fraction form
    128,616.14/177,490.29 = 72,027.51/x
  3. Step 3: Cross multiply
    128,616.14x = 177,490.29 × 72,027.51
  4. Step 4: Simplify right side
    128,616.14x = 12,784,183,277.74
  5. Step 5: Solve for x
    x = 12,784,183,277.74/128,616.14
  6. Step 6: Final answer
    x = 99,397.97

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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.