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Finding the Fourth Proportional to 28,174.74, 38,839.74 and 21,448.65

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Solution

The fourth proportional to 28,174.74, 38,839.74 and 21,448.65 is: 29,567.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,174.74 : 38,839.74 = 21,448.65 : x
  2. Step 2: Convert to fraction form
    28,174.74/38,839.74 = 21,448.65/x
  3. Step 3: Cross multiply
    28,174.74x = 38,839.74 × 21,448.65
  4. Step 4: Simplify right side
    28,174.74x = 833,059,989.35
  5. Step 5: Solve for x
    x = 833,059,989.35/28,174.74
  6. Step 6: Final answer
    x = 29,567.62

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1.5x scale

Why These Related Problems?

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