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Finding the Fourth Proportional to 15,812.58, 21,821.39 and 8,739

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Solution

The fourth proportional to 15,812.58, 21,821.39 and 8,739 is: 12,059.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,812.58 : 21,821.39 = 8,739 : x
  2. Step 2: Convert to fraction form
    15,812.58/21,821.39 = 8,739/x
  3. Step 3: Cross multiply
    15,812.58x = 21,821.39 × 8,739
  4. Step 4: Simplify right side
    15,812.58x = 190,697,127.21
  5. Step 5: Solve for x
    x = 190,697,127.21/15,812.58
  6. Step 6: Final answer
    x = 12,059.84

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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.