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Finding the Fourth Proportional to 78,409.62, 117,632.07 and 25,817.22

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Solution

The fourth proportional to 78,409.62, 117,632.07 and 25,817.22 is: 38,731.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,409.62 : 117,632.07 = 25,817.22 : x
  2. Step 2: Convert to fraction form
    78,409.62/117,632.07 = 25,817.22/x
  3. Step 3: Cross multiply
    78,409.62x = 117,632.07 × 25,817.22
  4. Step 4: Simplify right side
    78,409.62x = 3,036,933,030.25
  5. Step 5: Solve for x
    x = 3,036,933,030.25/78,409.62
  6. Step 6: Final answer
    x = 38,731.64

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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.