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Finding the Fourth Proportional to 71,728.70, 98,917.65 and 45,895.43

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Solution

The fourth proportional to 71,728.70, 98,917.65 and 45,895.43 is: 63,292.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    71,728.70 : 98,917.65 = 45,895.43 : x
  2. Step 2: Convert to fraction form
    71,728.70/98,917.65 = 45,895.43/x
  3. Step 3: Cross multiply
    71,728.70x = 98,917.65 × 45,895.43
  4. Step 4: Simplify right side
    71,728.70x = 4,539,868,081.34
  5. Step 5: Solve for x
    x = 4,539,868,081.34/71,728.70
  6. Step 6: Final answer
    x = 63,292.21

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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.