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Finding the Fourth Proportional to 303.40, 455.10 and 286.60

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Solution

The fourth proportional to 303.40, 455.10 and 286.60 is: 429.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    303.40 : 455.10 = 286.60 : x
  2. Step 2: Convert to fraction form
    303.40/455.10 = 286.60/x
  3. Step 3: Cross multiply
    303.40x = 455.10 × 286.60
  4. Step 4: Simplify right side
    303.40x = 130,431.66
  5. Step 5: Solve for x
    x = 130,431.66/303.40
  6. Step 6: Final answer
    x = 429.90

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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.