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Finding the Fourth Proportional to 15,392, 21,243.03 and 8,678.99

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Solution

The fourth proportional to 15,392, 21,243.03 and 8,678.99 is: 11,978.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,392 : 21,243.03 = 8,678.99 : x
  2. Step 2: Convert to fraction form
    15,392/21,243.03 = 8,678.99/x
  3. Step 3: Cross multiply
    15,392x = 21,243.03 × 8,678.99
  4. Step 4: Simplify right side
    15,392x = 184,368,044.94
  5. Step 5: Solve for x
    x = 184,368,044.94/15,392
  6. Step 6: Final answer
    x = 11,978.17

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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.