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Finding the Fourth Proportional to 28,672, 43,002.72 and 7,892.80

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Solution

The fourth proportional to 28,672, 43,002.72 and 7,892.80 is: 11,837.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,672 : 43,002.72 = 7,892.80 : x
  2. Step 2: Convert to fraction form
    28,672/43,002.72 = 7,892.80/x
  3. Step 3: Cross multiply
    28,672x = 43,002.72 × 7,892.80
  4. Step 4: Simplify right side
    28,672x = 339,411,868.42
  5. Step 5: Solve for x
    x = 339,411,868.42/28,672
  6. Step 6: Final answer
    x = 11,837.75

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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.