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Finding the Fourth Proportional to 128,063.52, 176,735.34 and 71,478.54

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Solution

The fourth proportional to 128,063.52, 176,735.34 and 71,478.54 is: 98,644.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,063.52 : 176,735.34 = 71,478.54 : x
  2. Step 2: Convert to fraction form
    128,063.52/176,735.34 = 71,478.54/x
  3. Step 3: Cross multiply
    128,063.52x = 176,735.34 × 71,478.54
  4. Step 4: Simplify right side
    128,063.52x = 12,632,784,069.60
  5. Step 5: Solve for x
    x = 12,632,784,069.60/128,063.52
  6. Step 6: Final answer
    x = 98,644.67

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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.