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Finding the Fourth Proportional to 45,870.66, 68,806.71 and 20,909.70

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Solution

The fourth proportional to 45,870.66, 68,806.71 and 20,909.70 is: 31,364.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    45,870.66 : 68,806.71 = 20,909.70 : x
  2. Step 2: Convert to fraction form
    45,870.66/68,806.71 = 20,909.70/x
  3. Step 3: Cross multiply
    45,870.66x = 68,806.71 × 20,909.70
  4. Step 4: Simplify right side
    45,870.66x = 1,438,727,664.09
  5. Step 5: Solve for x
    x = 1,438,727,664.09/45,870.66
  6. Step 6: Final answer
    x = 31,364.88

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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.