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Finding the Fourth Proportional to 620.80, 856.32 and 372.16

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Solution

The fourth proportional to 620.80, 856.32 and 372.16 is: 513.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    620.80 : 856.32 = 372.16 : x
  2. Step 2: Convert to fraction form
    620.80/856.32 = 372.16/x
  3. Step 3: Cross multiply
    620.80x = 856.32 × 372.16
  4. Step 4: Simplify right side
    620.80x = 318,688.05
  5. Step 5: Solve for x
    x = 318,688.05/620.80
  6. Step 6: Final answer
    x = 513.35

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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.