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Finding the Fourth Proportional to 455.40, 683.10 and 272.70

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Solution

The fourth proportional to 455.40, 683.10 and 272.70 is: 409.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    455.40 : 683.10 = 272.70 : x
  2. Step 2: Convert to fraction form
    455.40/683.10 = 272.70/x
  3. Step 3: Cross multiply
    455.40x = 683.10 × 272.70
  4. Step 4: Simplify right side
    455.40x = 186,281.37
  5. Step 5: Solve for x
    x = 186,281.37/455.40
  6. Step 6: Final answer
    x = 409.05

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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.