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Finding the Fourth Proportional to 621.35, 931.60 and 255.69

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Solution

The fourth proportional to 621.35, 931.60 and 255.69 is: 383.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    621.35 : 931.60 = 255.69 : x
  2. Step 2: Convert to fraction form
    621.35/931.60 = 255.69/x
  3. Step 3: Cross multiply
    621.35x = 931.60 × 255.69
  4. Step 4: Simplify right side
    621.35x = 238,200.80
  5. Step 5: Solve for x
    x = 238,200.80/621.35
  6. Step 6: Final answer
    x = 383.36

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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.