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Finding the Fourth Proportional to 15,618.86, 21,554 and 8,545.28

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Solution

The fourth proportional to 15,618.86, 21,554 and 8,545.28 is: 11,792.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,618.86 : 21,554 = 8,545.28 : x
  2. Step 2: Convert to fraction form
    15,618.86/21,554 = 8,545.28/x
  3. Step 3: Cross multiply
    15,618.86x = 21,554 × 8,545.28
  4. Step 4: Simplify right side
    15,618.86x = 184,184,965.12
  5. Step 5: Solve for x
    x = 184,184,965.12/15,618.86
  6. Step 6: Final answer
    x = 11,792.47

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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.