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Finding the Fourth Proportional to 69,392.90, 103,921.58 and 39,720.80

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Solution

The fourth proportional to 69,392.90, 103,921.58 and 39,720.80 is: 59,485.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    69,392.90 : 103,921.58 = 39,720.80 : x
  2. Step 2: Convert to fraction form
    69,392.90/103,921.58 = 39,720.80/x
  3. Step 3: Cross multiply
    69,392.90x = 103,921.58 × 39,720.80
  4. Step 4: Simplify right side
    69,392.90x = 4,127,848,294.86
  5. Step 5: Solve for x
    x = 4,127,848,294.86/69,392.90
  6. Step 6: Final answer
    x = 59,485.17

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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.