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Finding the Fourth Proportional to 450.18, 621.12 and 292.80

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Solution

The fourth proportional to 450.18, 621.12 and 292.80 is: 403.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    450.18 : 621.12 = 292.80 : x
  2. Step 2: Convert to fraction form
    450.18/621.12 = 292.80/x
  3. Step 3: Cross multiply
    450.18x = 621.12 × 292.80
  4. Step 4: Simplify right side
    450.18x = 181,863.94
  5. Step 5: Solve for x
    x = 181,863.94/450.18
  6. Step 6: Final answer
    x = 403.98

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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.