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Finding the Fourth Proportional to 70,959.80, 106,457.21 and 21,039.89

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Solution

The fourth proportional to 70,959.80, 106,457.21 and 21,039.89 is: 31,565.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    70,959.80 : 106,457.21 = 21,039.89 : x
  2. Step 2: Convert to fraction form
    70,959.80/106,457.21 = 21,039.89/x
  3. Step 3: Cross multiply
    70,959.80x = 106,457.21 × 21,039.89
  4. Step 4: Simplify right side
    70,959.80x = 2,239,847,350.62
  5. Step 5: Solve for x
    x = 2,239,847,350.62/70,959.80
  6. Step 6: Final answer
    x = 31,565.02

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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.