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Finding the Fourth Proportional to 69,042.75, 103,565.40 and 21,656.79

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Solution

The fourth proportional to 69,042.75, 103,565.40 and 21,656.79 is: 32,485.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    69,042.75 : 103,565.40 = 21,656.79 : x
  2. Step 2: Convert to fraction form
    69,042.75/103,565.40 = 21,656.79/x
  3. Step 3: Cross multiply
    69,042.75x = 103,565.40 × 21,656.79
  4. Step 4: Simplify right side
    69,042.75x = 2,242,894,119.07
  5. Step 5: Solve for x
    x = 2,242,894,119.07/69,042.75
  6. Step 6: Final answer
    x = 32,485.58

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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.