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Finding the Fourth Proportional to 128,411.49, 177,213.06 and 71,049.81

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Solution

The fourth proportional to 128,411.49, 177,213.06 and 71,049.81 is: 98,051.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,411.49 : 177,213.06 = 71,049.81 : x
  2. Step 2: Convert to fraction form
    128,411.49/177,213.06 = 71,049.81/x
  3. Step 3: Cross multiply
    128,411.49x = 177,213.06 × 71,049.81
  4. Step 4: Simplify right side
    128,411.49x = 12,590,954,242.52
  5. Step 5: Solve for x
    x = 12,590,954,242.52/128,411.49
  6. Step 6: Final answer
    x = 98,051.62

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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.