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Finding the Fourth Proportional to 421.37, 581.26 and 290.15

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Solution

The fourth proportional to 421.37, 581.26 and 290.15 is: 400.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    421.37 : 581.26 = 290.15 : x
  2. Step 2: Convert to fraction form
    421.37/581.26 = 290.15/x
  3. Step 3: Cross multiply
    421.37x = 581.26 × 290.15
  4. Step 4: Simplify right side
    421.37x = 168,648.23
  5. Step 5: Solve for x
    x = 168,648.23/421.37
  6. Step 6: Final answer
    x = 400.24

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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.