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Finding the Fourth Proportional to 320.33, 440.90 and 278.68

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Solution

The fourth proportional to 320.33, 440.90 and 278.68 is: 383.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    320.33 : 440.90 = 278.68 : x
  2. Step 2: Convert to fraction form
    320.33/440.90 = 278.68/x
  3. Step 3: Cross multiply
    320.33x = 440.90 × 278.68
  4. Step 4: Simplify right side
    320.33x = 122,870.01
  5. Step 5: Solve for x
    x = 122,870.01/320.33
  6. Step 6: Final answer
    x = 383.57

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.