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Finding the Fourth Proportional to 128,680.50, 177,589.86 and 71,333.84

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Solution

The fourth proportional to 128,680.50, 177,589.86 and 71,333.84 is: 98,446.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,680.50 : 177,589.86 = 71,333.84 : x
  2. Step 2: Convert to fraction form
    128,680.50/177,589.86 = 71,333.84/x
  3. Step 3: Cross multiply
    128,680.50x = 177,589.86 × 71,333.84
  4. Step 4: Simplify right side
    128,680.50x = 12,668,166,658.86
  5. Step 5: Solve for x
    x = 12,668,166,658.86/128,680.50
  6. Step 6: Final answer
    x = 98,446.67

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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.