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Finding the Fourth Proportional to 223,705.80, 308,727.28 and 128,218.66

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Solution

The fourth proportional to 223,705.80, 308,727.28 and 128,218.66 is: 176,949.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    223,705.80 : 308,727.28 = 128,218.66 : x
  2. Step 2: Convert to fraction form
    223,705.80/308,727.28 = 128,218.66/x
  3. Step 3: Cross multiply
    223,705.80x = 308,727.28 × 128,218.66
  4. Step 4: Simplify right side
    223,705.80x = 39,584,598,147.04
  5. Step 5: Solve for x
    x = 39,584,598,147.04/223,705.80
  6. Step 6: Final answer
    x = 176,949.36

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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.