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Finding the Fourth Proportional to 45,415.80, 68,042.70 and 21,990.60

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Solution

The fourth proportional to 45,415.80, 68,042.70 and 21,990.60 is: 32,946.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    45,415.80 : 68,042.70 = 21,990.60 : x
  2. Step 2: Convert to fraction form
    45,415.80/68,042.70 = 21,990.60/x
  3. Step 3: Cross multiply
    45,415.80x = 68,042.70 × 21,990.60
  4. Step 4: Simplify right side
    45,415.80x = 1,496,299,798.62
  5. Step 5: Solve for x
    x = 1,496,299,798.62/45,415.80
  6. Step 6: Final answer
    x = 32,946.68

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1.5x scale

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.