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Finding the Fourth Proportional to 28,403, 39,181.23 and 21,676.91

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Solution

The fourth proportional to 28,403, 39,181.23 and 21,676.91 is: 29,902.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,403 : 39,181.23 = 21,676.91 : x
  2. Step 2: Convert to fraction form
    28,403/39,181.23 = 21,676.91/x
  3. Step 3: Cross multiply
    28,403x = 39,181.23 × 21,676.91
  4. Step 4: Simplify right side
    28,403x = 849,327,996.40
  5. Step 5: Solve for x
    x = 849,327,996.40/28,403
  6. Step 6: Final answer
    x = 29,902.76

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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.