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Finding the Fourth Proportional to 405.22, 607.40 and 261.04

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Solution

The fourth proportional to 405.22, 607.40 and 261.04 is: 391.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    405.22 : 607.40 = 261.04 : x
  2. Step 2: Convert to fraction form
    405.22/607.40 = 261.04/x
  3. Step 3: Cross multiply
    405.22x = 607.40 × 261.04
  4. Step 4: Simplify right side
    405.22x = 158,555.70
  5. Step 5: Solve for x
    x = 158,555.70/405.22
  6. Step 6: Final answer
    x = 391.28

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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.