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Finding the Fourth Proportional to 405.40, 608.79 and 314.74

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Solution

The fourth proportional to 405.40, 608.79 and 314.74 is: 472.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    405.40 : 608.79 = 314.74 : x
  2. Step 2: Convert to fraction form
    405.40/608.79 = 314.74/x
  3. Step 3: Cross multiply
    405.40x = 608.79 × 314.74
  4. Step 4: Simplify right side
    405.40x = 191,610.56
  5. Step 5: Solve for x
    x = 191,610.56/405.40
  6. Step 6: Final answer
    x = 472.65

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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.