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Finding the Fourth Proportional to 620.40, 931.04 and 255.36

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Solution

The fourth proportional to 620.40, 931.04 and 255.36 is: 383.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    620.40 : 931.04 = 255.36 : x
  2. Step 2: Convert to fraction form
    620.40/931.04 = 255.36/x
  3. Step 3: Cross multiply
    620.40x = 931.04 × 255.36
  4. Step 4: Simplify right side
    620.40x = 237,750.37
  5. Step 5: Solve for x
    x = 237,750.37/620.40
  6. Step 6: Final answer
    x = 383.22

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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.