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Finding the Fourth Proportional to 128,651.72, 177,537.30 and 72,062.92

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Solution

The fourth proportional to 128,651.72, 177,537.30 and 72,062.92 is: 99,445.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,651.72 : 177,537.30 = 72,062.92 : x
  2. Step 2: Convert to fraction form
    128,651.72/177,537.30 = 72,062.92/x
  3. Step 3: Cross multiply
    128,651.72x = 177,537.30 × 72,062.92
  4. Step 4: Simplify right side
    128,651.72x = 12,793,856,246.92
  5. Step 5: Solve for x
    x = 12,793,856,246.92/128,651.72
  6. Step 6: Final answer
    x = 99,445.67

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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.