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Finding the Fourth Proportional to 128,748, 177,633.12 and 81,048.96

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Solution

The fourth proportional to 128,748, 177,633.12 and 81,048.96 is: 111,822.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,748 : 177,633.12 = 81,048.96 : x
  2. Step 2: Convert to fraction form
    128,748/177,633.12 = 81,048.96/x
  3. Step 3: Cross multiply
    128,748x = 177,633.12 × 81,048.96
  4. Step 4: Simplify right side
    128,748x = 14,396,979,637.56
  5. Step 5: Solve for x
    x = 14,396,979,637.56/128,748
  6. Step 6: Final answer
    x = 111,822.94

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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.