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Finding the Fourth Proportional to 15,812.90, 21,821.49 and 8,739.62

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Solution

The fourth proportional to 15,812.90, 21,821.49 and 8,739.62 is: 12,060.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,812.90 : 21,821.49 = 8,739.62 : x
  2. Step 2: Convert to fraction form
    15,812.90/21,821.49 = 8,739.62/x
  3. Step 3: Cross multiply
    15,812.90x = 21,821.49 × 8,739.62
  4. Step 4: Simplify right side
    15,812.90x = 190,711,530.43
  5. Step 5: Solve for x
    x = 190,711,530.43/15,812.90
  6. Step 6: Final answer
    x = 12,060.50

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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.