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Finding the Fourth Proportional to 45,608.35, 68,411.03 and 20,648.40

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Solution

The fourth proportional to 45,608.35, 68,411.03 and 20,648.40 is: 30,971.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    45,608.35 : 68,411.03 = 20,648.40 : x
  2. Step 2: Convert to fraction form
    45,608.35/68,411.03 = 20,648.40/x
  3. Step 3: Cross multiply
    45,608.35x = 68,411.03 × 20,648.40
  4. Step 4: Simplify right side
    45,608.35x = 1,412,578,208.61
  5. Step 5: Solve for x
    x = 1,412,578,208.61/45,608.35
  6. Step 6: Final answer
    x = 30,971.92

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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.