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Finding the Fourth Proportional to 71,105.80, 98,133.78 and 45,639.40

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Solution

The fourth proportional to 71,105.80, 98,133.78 and 45,639.40 is: 62,987.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    71,105.80 : 98,133.78 = 45,639.40 : x
  2. Step 2: Convert to fraction form
    71,105.80/98,133.78 = 45,639.40/x
  3. Step 3: Cross multiply
    71,105.80x = 98,133.78 × 45,639.40
  4. Step 4: Simplify right side
    71,105.80x = 4,478,766,838.93
  5. Step 5: Solve for x
    x = 4,478,766,838.93/71,105.80
  6. Step 6: Final answer
    x = 62,987.36

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.