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Finding the Fourth Proportional to 15,878.60, 21,912.60 and 8,805.12

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Solution

The fourth proportional to 15,878.60, 21,912.60 and 8,805.12 is: 12,151.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,878.60 : 21,912.60 = 8,805.12 : x
  2. Step 2: Convert to fraction form
    15,878.60/21,912.60 = 8,805.12/x
  3. Step 3: Cross multiply
    15,878.60x = 21,912.60 × 8,805.12
  4. Step 4: Simplify right side
    15,878.60x = 192,943,072.51
  5. Step 5: Solve for x
    x = 192,943,072.51/15,878.60
  6. Step 6: Final answer
    x = 12,151.14

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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.