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Finding the Fourth Proportional to 405.43, 607.95 and 131.37

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Solution

The fourth proportional to 405.43, 607.95 and 131.37 is: 196.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    405.43 : 607.95 = 131.37 : x
  2. Step 2: Convert to fraction form
    405.43/607.95 = 131.37/x
  3. Step 3: Cross multiply
    405.43x = 607.95 × 131.37
  4. Step 4: Simplify right side
    405.43x = 79,864.11
  5. Step 5: Solve for x
    x = 79,864.11/405.43
  6. Step 6: Final answer
    x = 196.99

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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.