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Finding the Fourth Proportional to 15,812.37, 21,821.37 and 8,642.73

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Solution

The fourth proportional to 15,812.37, 21,821.37 and 8,642.73 is: 11,927.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,812.37 : 21,821.37 = 8,642.73 : x
  2. Step 2: Convert to fraction form
    15,812.37/21,821.37 = 8,642.73/x
  3. Step 3: Cross multiply
    15,812.37x = 21,821.37 × 8,642.73
  4. Step 4: Simplify right side
    15,812.37x = 188,596,209.14
  5. Step 5: Solve for x
    x = 188,596,209.14/15,812.37
  6. Step 6: Final answer
    x = 11,927.13

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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.