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Finding the Fourth Proportional to 15,812.84, 21,821.50 and 8,739.11

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Solution

The fourth proportional to 15,812.84, 21,821.50 and 8,739.11 is: 12,059.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,812.84 : 21,821.50 = 8,739.11 : x
  2. Step 2: Convert to fraction form
    15,812.84/21,821.50 = 8,739.11/x
  3. Step 3: Cross multiply
    15,812.84x = 21,821.50 × 8,739.11
  4. Step 4: Simplify right side
    15,812.84x = 190,700,554.34
  5. Step 5: Solve for x
    x = 190,700,554.34/15,812.84
  6. Step 6: Final answer
    x = 12,059.85

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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.