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Finding the Fourth Proportional to 27,980.91, 38,613.69 and 15,405.66

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Solution

The fourth proportional to 27,980.91, 38,613.69 and 15,405.66 is: 21,259.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    27,980.91 : 38,613.69 = 15,405.66 : x
  2. Step 2: Convert to fraction form
    27,980.91/38,613.69 = 15,405.66/x
  3. Step 3: Cross multiply
    27,980.91x = 38,613.69 × 15,405.66
  4. Step 4: Simplify right side
    27,980.91x = 594,869,379.49
  5. Step 5: Solve for x
    x = 594,869,379.49/27,980.91
  6. Step 6: Final answer
    x = 21,259.83

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These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.