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Finding the Fourth Proportional to 128,609.81, 177,479.62 and 71,249.01

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Solution

The fourth proportional to 128,609.81, 177,479.62 and 71,249.01 is: 98,322.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,609.81 : 177,479.62 = 71,249.01 : x
  2. Step 2: Convert to fraction form
    128,609.81/177,479.62 = 71,249.01/x
  3. Step 3: Cross multiply
    128,609.81x = 177,479.62 × 71,249.01
  4. Step 4: Simplify right side
    128,609.81x = 12,645,245,976.53
  5. Step 5: Solve for x
    x = 12,645,245,976.53/128,609.81
  6. Step 6: Final answer
    x = 98,322.57

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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.