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Finding the Fourth Proportional to 450.40, 621.78 and 275.68

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Solution

The fourth proportional to 450.40, 621.78 and 275.68 is: 380.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    450.40 : 621.78 = 275.68 : x
  2. Step 2: Convert to fraction form
    450.40/621.78 = 275.68/x
  3. Step 3: Cross multiply
    450.40x = 621.78 × 275.68
  4. Step 4: Simplify right side
    450.40x = 171,412.31
  5. Step 5: Solve for x
    x = 171,412.31/450.40
  6. Step 6: Final answer
    x = 380.58

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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.