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Finding the Fourth Proportional to 620.61, 856.26 and 358.62

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Solution

The fourth proportional to 620.61, 856.26 and 358.62 is: 494.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    620.61 : 856.26 = 358.62 : x
  2. Step 2: Convert to fraction form
    620.61/856.26 = 358.62/x
  3. Step 3: Cross multiply
    620.61x = 856.26 × 358.62
  4. Step 4: Simplify right side
    620.61x = 307,071.96
  5. Step 5: Solve for x
    x = 307,071.96/620.61
  6. Step 6: Final answer
    x = 494.79

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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.