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Finding the Fourth Proportional to 405.43, 607.41 and 390.43

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Solution

The fourth proportional to 405.43, 607.41 and 390.43 is: 584.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    405.43 : 607.41 = 390.43 : x
  2. Step 2: Convert to fraction form
    405.43/607.41 = 390.43/x
  3. Step 3: Cross multiply
    405.43x = 607.41 × 390.43
  4. Step 4: Simplify right side
    405.43x = 237,151.09
  5. Step 5: Solve for x
    x = 237,151.09/405.43
  6. Step 6: Final answer
    x = 584.94

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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.