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Finding the Fourth Proportional to 70,608.76, 105,927.72 and 20,690.48

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Solution

The fourth proportional to 70,608.76, 105,927.72 and 20,690.48 is: 31,039.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    70,608.76 : 105,927.72 = 20,690.48 : x
  2. Step 2: Convert to fraction form
    70,608.76/105,927.72 = 20,690.48/x
  3. Step 3: Cross multiply
    70,608.76x = 105,927.72 × 20,690.48
  4. Step 4: Simplify right side
    70,608.76x = 2,191,695,268.65
  5. Step 5: Solve for x
    x = 2,191,695,268.65/70,608.76
  6. Step 6: Final answer
    x = 31,039.99

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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.