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Finding the Fourth Proportional to 19,989.12, 29,978.45 and 5,945.36

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Solution

The fourth proportional to 19,989.12, 29,978.45 and 5,945.36 is: 8,916.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    19,989.12 : 29,978.45 = 5,945.36 : x
  2. Step 2: Convert to fraction form
    19,989.12/29,978.45 = 5,945.36/x
  3. Step 3: Cross multiply
    19,989.12x = 29,978.45 × 5,945.36
  4. Step 4: Simplify right side
    19,989.12x = 178,232,647.77
  5. Step 5: Solve for x
    x = 178,232,647.77/19,989.12
  6. Step 6: Final answer
    x = 8,916.49

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.