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Finding the Fourth Proportional to 128,812.62, 177,771.74 and 71,457.60

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Solution

The fourth proportional to 128,812.62, 177,771.74 and 71,457.60 is: 98,617.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,812.62 : 177,771.74 = 71,457.60 : x
  2. Step 2: Convert to fraction form
    128,812.62/177,771.74 = 71,457.60/x
  3. Step 3: Cross multiply
    128,812.62x = 177,771.74 × 71,457.60
  4. Step 4: Simplify right side
    128,812.62x = 12,703,141,530.94
  5. Step 5: Solve for x
    x = 12,703,141,530.94/128,812.62
  6. Step 6: Final answer
    x = 98,617.21

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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.