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Finding the Fourth Proportional to 620.95, 856.88 and 355.43

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Solution

The fourth proportional to 620.95, 856.88 and 355.43 is: 490.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    620.95 : 856.88 = 355.43 : x
  2. Step 2: Convert to fraction form
    620.95/856.88 = 355.43/x
  3. Step 3: Cross multiply
    620.95x = 856.88 × 355.43
  4. Step 4: Simplify right side
    620.95x = 304,560.86
  5. Step 5: Solve for x
    x = 304,560.86/620.95
  6. Step 6: Final answer
    x = 490.48

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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.