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Finding the Fourth Proportional to 620.31, 856.04 and 340.55

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Solution

The fourth proportional to 620.31, 856.04 and 340.55 is: 469.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    620.31 : 856.04 = 340.55 : x
  2. Step 2: Convert to fraction form
    620.31/856.04 = 340.55/x
  3. Step 3: Cross multiply
    620.31x = 856.04 × 340.55
  4. Step 4: Simplify right side
    620.31x = 291,522.49
  5. Step 5: Solve for x
    x = 291,522.49/620.31
  6. Step 6: Final answer
    x = 469.96

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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.