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Finding the Fourth Proportional to 15,579, 21,499.02 and 9,990

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Solution

The fourth proportional to 15,579, 21,499.02 and 9,990 is: 13,786.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,579 : 21,499.02 = 9,990 : x
  2. Step 2: Convert to fraction form
    15,579/21,499.02 = 9,990/x
  3. Step 3: Cross multiply
    15,579x = 21,499.02 × 9,990
  4. Step 4: Simplify right side
    15,579x = 214,775,209.80
  5. Step 5: Solve for x
    x = 214,775,209.80/15,579
  6. Step 6: Final answer
    x = 13,786.20

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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.