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Finding the Fourth Proportional to 170,421.80, 255,440.70 and 81,717.80

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Solution

The fourth proportional to 170,421.80, 255,440.70 and 81,717.80 is: 122,484.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    170,421.80 : 255,440.70 = 81,717.80 : x
  2. Step 2: Convert to fraction form
    170,421.80/255,440.70 = 81,717.80/x
  3. Step 3: Cross multiply
    170,421.80x = 255,440.70 × 81,717.80
  4. Step 4: Simplify right side
    170,421.80x = 20,874,052,034.46
  5. Step 5: Solve for x
    x = 20,874,052,034.46/170,421.80
  6. Step 6: Final answer
    x = 122,484.64

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.