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Finding the Fourth Proportional to 15,679.55, 21,637.95 and 8,605.82

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Solution

The fourth proportional to 15,679.55, 21,637.95 and 8,605.82 is: 11,876.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,679.55 : 21,637.95 = 8,605.82 : x
  2. Step 2: Convert to fraction form
    15,679.55/21,637.95 = 8,605.82/x
  3. Step 3: Cross multiply
    15,679.55x = 21,637.95 × 8,605.82
  4. Step 4: Simplify right side
    15,679.55x = 186,212,302.87
  5. Step 5: Solve for x
    x = 186,212,302.87/15,679.55
  6. Step 6: Final answer
    x = 11,876.13

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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.