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Finding the Fourth Proportional to 128,497.32, 177,323.56 and 71,133.36

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Solution

The fourth proportional to 128,497.32, 177,323.56 and 71,133.36 is: 98,162.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,497.32 : 177,323.56 = 71,133.36 : x
  2. Step 2: Convert to fraction form
    128,497.32/177,323.56 = 71,133.36/x
  3. Step 3: Cross multiply
    128,497.32x = 177,323.56 × 71,133.36
  4. Step 4: Simplify right side
    128,497.32x = 12,613,620,629.96
  5. Step 5: Solve for x
    x = 12,613,620,629.96/128,497.32
  6. Step 6: Final answer
    x = 98,162.52

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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.