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Finding the Fourth Proportional to 620.42, 856.42 and 465.62

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Solution

The fourth proportional to 620.42, 856.42 and 465.62 is: 642.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    620.42 : 856.42 = 465.62 : x
  2. Step 2: Convert to fraction form
    620.42/856.42 = 465.62/x
  3. Step 3: Cross multiply
    620.42x = 856.42 × 465.62
  4. Step 4: Simplify right side
    620.42x = 398,766.28
  5. Step 5: Solve for x
    x = 398,766.28/620.42
  6. Step 6: Final answer
    x = 642.74

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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.