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Finding the Fourth Proportional to 621.36, 931.44 and 255.66

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Solution

The fourth proportional to 621.36, 931.44 and 255.66 is: 383.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    621.36 : 931.44 = 255.66 : x
  2. Step 2: Convert to fraction form
    621.36/931.44 = 255.66/x
  3. Step 3: Cross multiply
    621.36x = 931.44 × 255.66
  4. Step 4: Simplify right side
    621.36x = 238,131.95
  5. Step 5: Solve for x
    x = 238,131.95/621.36
  6. Step 6: Final answer
    x = 383.24

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1.5x scale

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.