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Finding the Fourth Proportional to 620.92, 931.36 and 255.45

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Solution

The fourth proportional to 620.92, 931.36 and 255.45 is: 383.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    620.92 : 931.36 = 255.45 : x
  2. Step 2: Convert to fraction form
    620.92/931.36 = 255.45/x
  3. Step 3: Cross multiply
    620.92x = 931.36 × 255.45
  4. Step 4: Simplify right side
    620.92x = 237,915.91
  5. Step 5: Solve for x
    x = 237,915.91/620.92
  6. Step 6: Final answer
    x = 383.17

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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.