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Finding the Fourth Proportional to 128,639.72, 177,520.74 and 72,050.92

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Solution

The fourth proportional to 128,639.72, 177,520.74 and 72,050.92 is: 99,429.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,639.72 : 177,520.74 = 72,050.92 : x
  2. Step 2: Convert to fraction form
    128,639.72/177,520.74 = 72,050.92/x
  3. Step 3: Cross multiply
    128,639.72x = 177,520.74 × 72,050.92
  4. Step 4: Simplify right side
    128,639.72x = 12,790,532,636.08
  5. Step 5: Solve for x
    x = 12,790,532,636.08/128,639.72
  6. Step 6: Final answer
    x = 99,429.11

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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.