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Finding the Fourth Proportional to 450.93, 621.63 and 389.40

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Solution

The fourth proportional to 450.93, 621.63 and 389.40 is: 536.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    450.93 : 621.63 = 389.40 : x
  2. Step 2: Convert to fraction form
    450.93/621.63 = 389.40/x
  3. Step 3: Cross multiply
    450.93x = 621.63 × 389.40
  4. Step 4: Simplify right side
    450.93x = 242,062.72
  5. Step 5: Solve for x
    x = 242,062.72/450.93
  6. Step 6: Final answer
    x = 536.81

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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.