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Finding the Fourth Proportional to 128,554.74, 177,388.88 and 71,966.16

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Solution

The fourth proportional to 128,554.74, 177,388.88 and 71,966.16 is: 99,303.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,554.74 : 177,388.88 = 71,966.16 : x
  2. Step 2: Convert to fraction form
    128,554.74/177,388.88 = 71,966.16/x
  3. Step 3: Cross multiply
    128,554.74x = 177,388.88 × 71,966.16
  4. Step 4: Simplify right side
    128,554.74x = 12,765,996,160.47
  5. Step 5: Solve for x
    x = 12,765,996,160.47/128,554.74
  6. Step 6: Final answer
    x = 99,303.97

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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.