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Finding the Fourth Proportional to 450,021.78, 620,735.76 and 288,621.18

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Solution

The fourth proportional to 450,021.78, 620,735.76 and 288,621.18 is: 398,108.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    450,021.78 : 620,735.76 = 288,621.18 : x
  2. Step 2: Convert to fraction form
    450,021.78/620,735.76 = 288,621.18/x
  3. Step 3: Cross multiply
    450,021.78x = 620,735.76 × 288,621.18
  4. Step 4: Simplify right side
    450,021.78x = 179,157,487,519.40
  5. Step 5: Solve for x
    x = 179,157,487,519.40/450,021.78
  6. Step 6: Final answer
    x = 398,108.48

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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.