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Finding the Fourth Proportional to 170,420.80, 255,439.20 and 81,716.80

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Solution

The fourth proportional to 170,420.80, 255,439.20 and 81,716.80 is: 122,483.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    170,420.80 : 255,439.20 = 81,716.80 : x
  2. Step 2: Convert to fraction form
    170,420.80/255,439.20 = 81,716.80/x
  3. Step 3: Cross multiply
    170,420.80x = 255,439.20 × 81,716.80
  4. Step 4: Simplify right side
    170,420.80x = 20,873,674,018.56
  5. Step 5: Solve for x
    x = 20,873,674,018.56/170,420.80
  6. Step 6: Final answer
    x = 122,483.14

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1.5x scale

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.