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Finding the Fourth Proportional to 129,762.81, 178,971.93 and 81,998.73

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Solution

The fourth proportional to 129,762.81, 178,971.93 and 81,998.73 is: 113,094.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    129,762.81 : 178,971.93 = 81,998.73 : x
  2. Step 2: Convert to fraction form
    129,762.81/178,971.93 = 81,998.73/x
  3. Step 3: Cross multiply
    129,762.81x = 178,971.93 × 81,998.73
  4. Step 4: Simplify right side
    129,762.81x = 14,675,470,965.65
  5. Step 5: Solve for x
    x = 14,675,470,965.65/129,762.81
  6. Step 6: Final answer
    x = 113,094.58

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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.