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Finding the Fourth Proportional to 450.26, 621.02 and 391.12

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Solution

The fourth proportional to 450.26, 621.02 and 391.12 is: 539.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    450.26 : 621.02 = 391.12 : x
  2. Step 2: Convert to fraction form
    450.26/621.02 = 391.12/x
  3. Step 3: Cross multiply
    450.26x = 621.02 × 391.12
  4. Step 4: Simplify right side
    450.26x = 242,893.34
  5. Step 5: Solve for x
    x = 242,893.34/450.26
  6. Step 6: Final answer
    x = 539.45

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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.