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Finding the Fourth Proportional to 8,999.88, 12,420 and 5,021.28

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Solution

The fourth proportional to 8,999.88, 12,420 and 5,021.28 is: 6,929.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,999.88 : 12,420 = 5,021.28 : x
  2. Step 2: Convert to fraction form
    8,999.88/12,420 = 5,021.28/x
  3. Step 3: Cross multiply
    8,999.88x = 12,420 × 5,021.28
  4. Step 4: Simplify right side
    8,999.88x = 62,364,297.60
  5. Step 5: Solve for x
    x = 62,364,297.60/8,999.88
  6. Step 6: Final answer
    x = 6,929.46

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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.