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Finding the Fourth Proportional to 450.21, 621.28 and 253.74

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Solution

The fourth proportional to 450.21, 621.28 and 253.74 is: 350.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    450.21 : 621.28 = 253.74 : x
  2. Step 2: Convert to fraction form
    450.21/621.28 = 253.74/x
  3. Step 3: Cross multiply
    450.21x = 621.28 × 253.74
  4. Step 4: Simplify right side
    450.21x = 157,643.59
  5. Step 5: Solve for x
    x = 157,643.59/450.21
  6. Step 6: Final answer
    x = 350.16

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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.