Home / 128,735.39-177,655.05-72,146.76

Finding the Fourth Proportional to 128,735.39, 177,655.05 and 72,146.76

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Solution

The fourth proportional to 128,735.39, 177,655.05 and 72,146.76 is: 99,562.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,735.39 : 177,655.05 = 72,146.76 : x
  2. Step 2: Convert to fraction form
    128,735.39/177,655.05 = 72,146.76/x
  3. Step 3: Cross multiply
    128,735.39x = 177,655.05 × 72,146.76
  4. Step 4: Simplify right side
    128,735.39x = 12,817,236,255.14
  5. Step 5: Solve for x
    x = 12,817,236,255.14/128,735.39
  6. Step 6: Final answer
    x = 99,562.65

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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.