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Finding the Fourth Proportional to 128,709.92, 177,422.80 and 90,361.88

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Solution

The fourth proportional to 128,709.92, 177,422.80 and 90,361.88 is: 124,561.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,709.92 : 177,422.80 = 90,361.88 : x
  2. Step 2: Convert to fraction form
    128,709.92/177,422.80 = 90,361.88/x
  3. Step 3: Cross multiply
    128,709.92x = 177,422.80 × 90,361.88
  4. Step 4: Simplify right side
    128,709.92x = 16,032,257,762.86
  5. Step 5: Solve for x
    x = 16,032,257,762.86/128,709.92
  6. Step 6: Final answer
    x = 124,561.17

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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.