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Finding the Fourth Proportional to 15,812.78, 21,821.42 and 8,739.05

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Solution

The fourth proportional to 15,812.78, 21,821.42 and 8,739.05 is: 12,059.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,812.78 : 21,821.42 = 8,739.05 : x
  2. Step 2: Convert to fraction form
    15,812.78/21,821.42 = 8,739.05/x
  3. Step 3: Cross multiply
    15,812.78x = 21,821.42 × 8,739.05
  4. Step 4: Simplify right side
    15,812.78x = 190,698,436.76
  5. Step 5: Solve for x
    x = 190,698,436.76/15,812.78
  6. Step 6: Final answer
    x = 12,059.77

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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.