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Finding the Fourth Proportional to 70,334.46, 105,479.64 and 20,418.01

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Solution

The fourth proportional to 70,334.46, 105,479.64 and 20,418.01 is: 30,620.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    70,334.46 : 105,479.64 = 20,418.01 : x
  2. Step 2: Convert to fraction form
    70,334.46/105,479.64 = 20,418.01/x
  3. Step 3: Cross multiply
    70,334.46x = 105,479.64 × 20,418.01
  4. Step 4: Simplify right side
    70,334.46x = 2,153,684,080.62
  5. Step 5: Solve for x
    x = 2,153,684,080.62/70,334.46
  6. Step 6: Final answer
    x = 30,620.61

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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.