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Finding the Fourth Proportional to 128,399.63, 177,248.24 and 76,734.95

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Solution

The fourth proportional to 128,399.63, 177,248.24 and 76,734.95 is: 105,928.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,399.63 : 177,248.24 = 76,734.95 : x
  2. Step 2: Convert to fraction form
    128,399.63/177,248.24 = 76,734.95/x
  3. Step 3: Cross multiply
    128,399.63x = 177,248.24 × 76,734.95
  4. Step 4: Simplify right side
    128,399.63x = 13,601,134,833.99
  5. Step 5: Solve for x
    x = 13,601,134,833.99/128,399.63
  6. Step 6: Final answer
    x = 105,928.15

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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.