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Finding the Fourth Proportional to 128,342.80, 177,041.96 and 74,621.88

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Solution

The fourth proportional to 128,342.80, 177,041.96 and 74,621.88 is: 102,936.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,342.80 : 177,041.96 = 74,621.88 : x
  2. Step 2: Convert to fraction form
    128,342.80/177,041.96 = 74,621.88/x
  3. Step 3: Cross multiply
    128,342.80x = 177,041.96 × 74,621.88
  4. Step 4: Simplify right side
    128,342.80x = 13,211,204,080.64
  5. Step 5: Solve for x
    x = 13,211,204,080.64/128,342.80
  6. Step 6: Final answer
    x = 102,936.85

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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.