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Finding the Fourth Proportional to 620.54, 856.74 and 384.74

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Solution

The fourth proportional to 620.54, 856.74 and 384.74 is: 531.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    620.54 : 856.74 = 384.74 : x
  2. Step 2: Convert to fraction form
    620.54/856.74 = 384.74/x
  3. Step 3: Cross multiply
    620.54x = 856.74 × 384.74
  4. Step 4: Simplify right side
    620.54x = 329,619.55
  5. Step 5: Solve for x
    x = 329,619.55/620.54
  6. Step 6: Final answer
    x = 531.18

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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.