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Finding the Fourth Proportional to 15,529, 21,430.04 and 8,455

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Solution

The fourth proportional to 15,529, 21,430.04 and 8,455 is: 11,667.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,529 : 21,430.04 = 8,455 : x
  2. Step 2: Convert to fraction form
    15,529/21,430.04 = 8,455/x
  3. Step 3: Cross multiply
    15,529x = 21,430.04 × 8,455
  4. Step 4: Simplify right side
    15,529x = 181,190,988.20
  5. Step 5: Solve for x
    x = 181,190,988.20/15,529
  6. Step 6: Final answer
    x = 11,667.91

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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.