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Finding the Fourth Proportional to 620.25, 855.81 and 358.26

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Solution

The fourth proportional to 620.25, 855.81 and 358.26 is: 494.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    620.25 : 855.81 = 358.26 : x
  2. Step 2: Convert to fraction form
    620.25/855.81 = 358.26/x
  3. Step 3: Cross multiply
    620.25x = 855.81 × 358.26
  4. Step 4: Simplify right side
    620.25x = 306,602.49
  5. Step 5: Solve for x
    x = 306,602.49/620.25
  6. Step 6: Final answer
    x = 494.32

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.