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Finding the Fourth Proportional to 12,989, 17,924.82 and 8,021

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Solution

The fourth proportional to 12,989, 17,924.82 and 8,021 is: 11,068.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,989 : 17,924.82 = 8,021 : x
  2. Step 2: Convert to fraction form
    12,989/17,924.82 = 8,021/x
  3. Step 3: Cross multiply
    12,989x = 17,924.82 × 8,021
  4. Step 4: Simplify right side
    12,989x = 143,774,981.22
  5. Step 5: Solve for x
    x = 143,774,981.22/12,989
  6. Step 6: Final answer
    x = 11,068.98

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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.