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Finding the Fourth Proportional to 15,620, 21,558.16 and 8,999.84

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Solution

The fourth proportional to 15,620, 21,558.16 and 8,999.84 is: 12,421.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,620 : 21,558.16 = 8,999.84 : x
  2. Step 2: Convert to fraction form
    15,620/21,558.16 = 8,999.84/x
  3. Step 3: Cross multiply
    15,620x = 21,558.16 × 8,999.84
  4. Step 4: Simplify right side
    15,620x = 194,019,990.69
  5. Step 5: Solve for x
    x = 194,019,990.69/15,620
  6. Step 6: Final answer
    x = 12,421.25

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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.