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Finding the Fourth Proportional to 405.10, 608.10 and 251.20

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Solution

The fourth proportional to 405.10, 608.10 and 251.20 is: 377.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    405.10 : 608.10 = 251.20 : x
  2. Step 2: Convert to fraction form
    405.10/608.10 = 251.20/x
  3. Step 3: Cross multiply
    405.10x = 608.10 × 251.20
  4. Step 4: Simplify right side
    405.10x = 152,754.72
  5. Step 5: Solve for x
    x = 152,754.72/405.10
  6. Step 6: Final answer
    x = 377.08

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.