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Finding the Fourth Proportional to 128,612.78, 177,426.54 and 83,305.88

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Solution

The fourth proportional to 128,612.78, 177,426.54 and 83,305.88 is: 114,923.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,612.78 : 177,426.54 = 83,305.88 : x
  2. Step 2: Convert to fraction form
    128,612.78/177,426.54 = 83,305.88/x
  3. Step 3: Cross multiply
    128,612.78x = 177,426.54 × 83,305.88
  4. Step 4: Simplify right side
    128,612.78x = 14,780,674,050.06
  5. Step 5: Solve for x
    x = 14,780,674,050.06/128,612.78
  6. Step 6: Final answer
    x = 114,923.84

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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.