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Finding the Fourth Proportional to 128,407.70, 177,215.88 and 73,961.67

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Solution

The fourth proportional to 128,407.70, 177,215.88 and 73,961.67 is: 102,074.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,407.70 : 177,215.88 = 73,961.67 : x
  2. Step 2: Convert to fraction form
    128,407.70/177,215.88 = 73,961.67/x
  3. Step 3: Cross multiply
    128,407.70x = 177,215.88 × 73,961.67
  4. Step 4: Simplify right side
    128,407.70x = 13,107,182,435.32
  5. Step 5: Solve for x
    x = 13,107,182,435.32/128,407.70
  6. Step 6: Final answer
    x = 102,074.74

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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.