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Finding the Fourth Proportional to 450.51, 621.15 and 388.23

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Solution

The fourth proportional to 450.51, 621.15 and 388.23 is: 535.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    450.51 : 621.15 = 388.23 : x
  2. Step 2: Convert to fraction form
    450.51/621.15 = 388.23/x
  3. Step 3: Cross multiply
    450.51x = 621.15 × 388.23
  4. Step 4: Simplify right side
    450.51x = 241,145.28
  5. Step 5: Solve for x
    x = 241,145.28/450.51
  6. Step 6: Final answer
    x = 535.28

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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.