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Finding the Fourth Proportional to 405.22, 607.28 and 185.72

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Solution

The fourth proportional to 405.22, 607.28 and 185.72 is: 278.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    405.22 : 607.28 = 185.72 : x
  2. Step 2: Convert to fraction form
    405.22/607.28 = 185.72/x
  3. Step 3: Cross multiply
    405.22x = 607.28 × 185.72
  4. Step 4: Simplify right side
    405.22x = 112,784.04
  5. Step 5: Solve for x
    x = 112,784.04/405.22
  6. Step 6: Final answer
    x = 278.33

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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.