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Finding the Fourth Proportional to 451.26, 621.50 and 389.07

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Solution

The fourth proportional to 451.26, 621.50 and 389.07 is: 535.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    451.26 : 621.50 = 389.07 : x
  2. Step 2: Convert to fraction form
    451.26/621.50 = 389.07/x
  3. Step 3: Cross multiply
    451.26x = 621.50 × 389.07
  4. Step 4: Simplify right side
    451.26x = 241,805.06
  5. Step 5: Solve for x
    x = 241,805.06/451.26
  6. Step 6: Final answer
    x = 535.84

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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.