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Finding the Fourth Proportional to 620.08, 856.70 and 553.11

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Solution

The fourth proportional to 620.08, 856.70 and 553.11 is: 764.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    620.08 : 856.70 = 553.11 : x
  2. Step 2: Convert to fraction form
    620.08/856.70 = 553.11/x
  3. Step 3: Cross multiply
    620.08x = 856.70 × 553.11
  4. Step 4: Simplify right side
    620.08x = 473,845.43
  5. Step 5: Solve for x
    x = 473,845.43/620.08
  6. Step 6: Final answer
    x = 764.17

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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.