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Finding the Fourth Proportional to 128,529.64, 177,449.70 and 101,780.20

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Solution

The fourth proportional to 128,529.64, 177,449.70 and 101,780.20 is: 140,519.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,529.64 : 177,449.70 = 101,780.20 : x
  2. Step 2: Convert to fraction form
    128,529.64/177,449.70 = 101,780.20/x
  3. Step 3: Cross multiply
    128,529.64x = 177,449.70 × 101,780.20
  4. Step 4: Simplify right side
    128,529.64x = 18,060,865,955.94
  5. Step 5: Solve for x
    x = 18,060,865,955.94/128,529.64
  6. Step 6: Final answer
    x = 140,519.07

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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.