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Finding the Fourth Proportional to 15,865.78, 21,894.45 and 8,792.14

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Solution

The fourth proportional to 15,865.78, 21,894.45 and 8,792.14 is: 12,132.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,865.78 : 21,894.45 = 8,792.14 : x
  2. Step 2: Convert to fraction form
    15,865.78/21,894.45 = 8,792.14/x
  3. Step 3: Cross multiply
    15,865.78x = 21,894.45 × 8,792.14
  4. Step 4: Simplify right side
    15,865.78x = 192,499,069.62
  5. Step 5: Solve for x
    x = 192,499,069.62/15,865.78
  6. Step 6: Final answer
    x = 12,132.97

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1.5x scale

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.