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Finding the Fourth Proportional to 72,728.08, 100,425 and 45,915.28

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Solution

The fourth proportional to 72,728.08, 100,425 and 45,915.28 is: 63,401.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,728.08 : 100,425 = 45,915.28 : x
  2. Step 2: Convert to fraction form
    72,728.08/100,425 = 45,915.28/x
  3. Step 3: Cross multiply
    72,728.08x = 100,425 × 45,915.28
  4. Step 4: Simplify right side
    72,728.08x = 4,611,041,994
  5. Step 5: Solve for x
    x = 4,611,041,994/72,728.08
  6. Step 6: Final answer
    x = 63,401.12

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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.