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Finding the Fourth Proportional to 405.42, 607.89 and 188.79

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Solution

The fourth proportional to 405.42, 607.89 and 188.79 is: 283.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    405.42 : 607.89 = 188.79 : x
  2. Step 2: Convert to fraction form
    405.42/607.89 = 188.79/x
  3. Step 3: Cross multiply
    405.42x = 607.89 × 188.79
  4. Step 4: Simplify right side
    405.42x = 114,763.55
  5. Step 5: Solve for x
    x = 114,763.55/405.42
  6. Step 6: Final answer
    x = 283.07

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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.