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Finding the Fourth Proportional to 318.89, 480.35 and 290.19

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Solution

The fourth proportional to 318.89, 480.35 and 290.19 is: 437.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    318.89 : 480.35 = 290.19 : x
  2. Step 2: Convert to fraction form
    318.89/480.35 = 290.19/x
  3. Step 3: Cross multiply
    318.89x = 480.35 × 290.19
  4. Step 4: Simplify right side
    318.89x = 139,391.32
  5. Step 5: Solve for x
    x = 139,391.32/318.89
  6. Step 6: Final answer
    x = 437.11

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.