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Finding the Fourth Proportional to 128,686.74, 177,583.41 and 71,323.62

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Solution

The fourth proportional to 128,686.74, 177,583.41 and 71,323.62 is: 98,424.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,686.74 : 177,583.41 = 71,323.62 : x
  2. Step 2: Convert to fraction form
    128,686.74/177,583.41 = 71,323.62/x
  3. Step 3: Cross multiply
    128,686.74x = 177,583.41 × 71,323.62
  4. Step 4: Simplify right side
    128,686.74x = 12,665,891,653.14
  5. Step 5: Solve for x
    x = 12,665,891,653.14/128,686.74
  6. Step 6: Final answer
    x = 98,424.22

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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.