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Finding the Fourth Proportional to 61,146.80, 91,698.60 and 21,705.20

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Solution

The fourth proportional to 61,146.80, 91,698.60 and 21,705.20 is: 32,550.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    61,146.80 : 91,698.60 = 21,705.20 : x
  2. Step 2: Convert to fraction form
    61,146.80/91,698.60 = 21,705.20/x
  3. Step 3: Cross multiply
    61,146.80x = 91,698.60 × 21,705.20
  4. Step 4: Simplify right side
    61,146.80x = 1,990,336,452.72
  5. Step 5: Solve for x
    x = 1,990,336,452.72/61,146.80
  6. Step 6: Final answer
    x = 32,550.13

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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.