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Finding the Fourth Proportional to 620.66, 856.32 and 355.08

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Solution

The fourth proportional to 620.66, 856.32 and 355.08 is: 489.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    620.66 : 856.32 = 355.08 : x
  2. Step 2: Convert to fraction form
    620.66/856.32 = 355.08/x
  3. Step 3: Cross multiply
    620.66x = 856.32 × 355.08
  4. Step 4: Simplify right side
    620.66x = 304,065.98
  5. Step 5: Solve for x
    x = 304,065.98/620.66
  6. Step 6: Final answer
    x = 489.91

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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.