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Finding the Fourth Proportional to 336.40, 504.60 and 287.80

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Solution

The fourth proportional to 336.40, 504.60 and 287.80 is: 431.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    336.40 : 504.60 = 287.80 : x
  2. Step 2: Convert to fraction form
    336.40/504.60 = 287.80/x
  3. Step 3: Cross multiply
    336.40x = 504.60 × 287.80
  4. Step 4: Simplify right side
    336.40x = 145,223.88
  5. Step 5: Solve for x
    x = 145,223.88/336.40
  6. Step 6: Final answer
    x = 431.70

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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.