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Finding the Fourth Proportional to 450.78, 621.91 and 282.70

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Solution

The fourth proportional to 450.78, 621.91 and 282.70 is: 390.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    450.78 : 621.91 = 282.70 : x
  2. Step 2: Convert to fraction form
    450.78/621.91 = 282.70/x
  3. Step 3: Cross multiply
    450.78x = 621.91 × 282.70
  4. Step 4: Simplify right side
    450.78x = 175,813.96
  5. Step 5: Solve for x
    x = 175,813.96/450.78
  6. Step 6: Final answer
    x = 390.02

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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.