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Finding the Fourth Proportional to 25,355.45, 34,978.88 and 16,405.87

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Solution

The fourth proportional to 25,355.45, 34,978.88 and 16,405.87 is: 22,632.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    25,355.45 : 34,978.88 = 16,405.87 : x
  2. Step 2: Convert to fraction form
    25,355.45/34,978.88 = 16,405.87/x
  3. Step 3: Cross multiply
    25,355.45x = 34,978.88 × 16,405.87
  4. Step 4: Simplify right side
    25,355.45x = 573,858,958.03
  5. Step 5: Solve for x
    x = 573,858,958.03/25,355.45
  6. Step 6: Final answer
    x = 22,632.57

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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.