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Finding the Fourth Proportional to 27,999.72, 38,676.42 and 20,913.84

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Solution

The fourth proportional to 27,999.72, 38,676.42 and 20,913.84 is: 28,888.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    27,999.72 : 38,676.42 = 20,913.84 : x
  2. Step 2: Convert to fraction form
    27,999.72/38,676.42 = 20,913.84/x
  3. Step 3: Cross multiply
    27,999.72x = 38,676.42 × 20,913.84
  4. Step 4: Simplify right side
    27,999.72x = 808,872,459.65
  5. Step 5: Solve for x
    x = 808,872,459.65/27,999.72
  6. Step 6: Final answer
    x = 28,888.59

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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.