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Finding the Fourth Proportional to 620.01, 930.21 and 388.62

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Solution

The fourth proportional to 620.01, 930.21 and 388.62 is: 583.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    620.01 : 930.21 = 388.62 : x
  2. Step 2: Convert to fraction form
    620.01/930.21 = 388.62/x
  3. Step 3: Cross multiply
    620.01x = 930.21 × 388.62
  4. Step 4: Simplify right side
    620.01x = 361,498.21
  5. Step 5: Solve for x
    x = 361,498.21/620.01
  6. Step 6: Final answer
    x = 583.05

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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.