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Finding the Fourth Proportional to 336.90, 505.35 and 131.40

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Solution

The fourth proportional to 336.90, 505.35 and 131.40 is: 197.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    336.90 : 505.35 = 131.40 : x
  2. Step 2: Convert to fraction form
    336.90/505.35 = 131.40/x
  3. Step 3: Cross multiply
    336.90x = 505.35 × 131.40
  4. Step 4: Simplify right side
    336.90x = 66,402.99
  5. Step 5: Solve for x
    x = 66,402.99/336.90
  6. Step 6: Final answer
    x = 197.10

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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.