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Finding the Fourth Proportional to 320.60, 445.40 and 317.60

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Solution

The fourth proportional to 320.60, 445.40 and 317.60 is: 441.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    320.60 : 445.40 = 317.60 : x
  2. Step 2: Convert to fraction form
    320.60/445.40 = 317.60/x
  3. Step 3: Cross multiply
    320.60x = 445.40 × 317.60
  4. Step 4: Simplify right side
    320.60x = 141,459.04
  5. Step 5: Solve for x
    x = 141,459.04/320.60
  6. Step 6: Final answer
    x = 441.23

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Why These Related Problems?

These problems maintain the same ratio (1.39) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.