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Finding the Fourth Proportional to 405.38, 607.91 and 131.40

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Solution

The fourth proportional to 405.38, 607.91 and 131.40 is: 197.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    405.38 : 607.91 = 131.40 : x
  2. Step 2: Convert to fraction form
    405.38/607.91 = 131.40/x
  3. Step 3: Cross multiply
    405.38x = 607.91 × 131.40
  4. Step 4: Simplify right side
    405.38x = 79,878.72
  5. Step 5: Solve for x
    x = 79,878.72/405.38
  6. Step 6: Final answer
    x = 197.05

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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.