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Finding the Fourth Proportional to 35,420, 48,879.32 and 21,089.66

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Solution

The fourth proportional to 35,420, 48,879.32 and 21,089.66 is: 29,103.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    35,420 : 48,879.32 = 21,089.66 : x
  2. Step 2: Convert to fraction form
    35,420/48,879.32 = 21,089.66/x
  3. Step 3: Cross multiply
    35,420x = 48,879.32 × 21,089.66
  4. Step 4: Simplify right side
    35,420x = 1,030,848,239.83
  5. Step 5: Solve for x
    x = 1,030,848,239.83/35,420
  6. Step 6: Final answer
    x = 29,103.56

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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.