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Finding the Fourth Proportional to 128,709, 177,618.42 and 72,138.60

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Solution

The fourth proportional to 128,709, 177,618.42 and 72,138.60 is: 99,551.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,709 : 177,618.42 = 72,138.60 : x
  2. Step 2: Convert to fraction form
    128,709/177,618.42 = 72,138.60/x
  3. Step 3: Cross multiply
    128,709x = 177,618.42 × 72,138.60
  4. Step 4: Simplify right side
    128,709x = 12,813,144,153.01
  5. Step 5: Solve for x
    x = 12,813,144,153.01/128,709
  6. Step 6: Final answer
    x = 99,551.27

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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.