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Finding the Fourth Proportional to 72,891.60, 100,554.12 and 49,019.28

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Solution

The fourth proportional to 72,891.60, 100,554.12 and 49,019.28 is: 67,622.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,891.60 : 100,554.12 = 49,019.28 : x
  2. Step 2: Convert to fraction form
    72,891.60/100,554.12 = 49,019.28/x
  3. Step 3: Cross multiply
    72,891.60x = 100,554.12 × 49,019.28
  4. Step 4: Simplify right side
    72,891.60x = 4,929,090,563.43
  5. Step 5: Solve for x
    x = 4,929,090,563.43/72,891.60
  6. Step 6: Final answer
    x = 67,622.20

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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.