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Finding the Fourth Proportional to 72,503.98, 108,735.09 and 19,915.18

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Solution

The fourth proportional to 72,503.98, 108,735.09 and 19,915.18 is: 29,867.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,503.98 : 108,735.09 = 19,915.18 : x
  2. Step 2: Convert to fraction form
    72,503.98/108,735.09 = 19,915.18/x
  3. Step 3: Cross multiply
    72,503.98x = 108,735.09 × 19,915.18
  4. Step 4: Simplify right side
    72,503.98x = 2,165,478,889.67
  5. Step 5: Solve for x
    x = 2,165,478,889.67/72,503.98
  6. Step 6: Final answer
    x = 29,867.03

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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.