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Finding the Fourth Proportional to 620.73, 856.64 and 384.81

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Solution

The fourth proportional to 620.73, 856.64 and 384.81 is: 531.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    620.73 : 856.64 = 384.81 : x
  2. Step 2: Convert to fraction form
    620.73/856.64 = 384.81/x
  3. Step 3: Cross multiply
    620.73x = 856.64 × 384.81
  4. Step 4: Simplify right side
    620.73x = 329,641.71
  5. Step 5: Solve for x
    x = 329,641.71/620.73
  6. Step 6: Final answer
    x = 531.05

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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.