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Finding the Fourth Proportional to 128,737.64, 177,471.84 and 90,380.42

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Solution

The fourth proportional to 128,737.64, 177,471.84 and 90,380.42 is: 124,594.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,737.64 : 177,471.84 = 90,380.42 : x
  2. Step 2: Convert to fraction form
    128,737.64/177,471.84 = 90,380.42/x
  3. Step 3: Cross multiply
    128,737.64x = 177,471.84 × 90,380.42
  4. Step 4: Simplify right side
    128,737.64x = 16,039,979,437.37
  5. Step 5: Solve for x
    x = 16,039,979,437.37/128,737.64
  6. Step 6: Final answer
    x = 124,594.33

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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.