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Finding the Fourth Proportional to 128,060.34, 176,746.40 and 76,380.75

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Solution

The fourth proportional to 128,060.34, 176,746.40 and 76,380.75 is: 105,419.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,060.34 : 176,746.40 = 76,380.75 : x
  2. Step 2: Convert to fraction form
    128,060.34/176,746.40 = 76,380.75/x
  3. Step 3: Cross multiply
    128,060.34x = 176,746.40 × 76,380.75
  4. Step 4: Simplify right side
    128,060.34x = 13,500,022,591.80
  5. Step 5: Solve for x
    x = 13,500,022,591.80/128,060.34
  6. Step 6: Final answer
    x = 105,419.23

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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.