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Finding the Fourth Proportional to 620.42, 856.14 and 340.65

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Solution

The fourth proportional to 620.42, 856.14 and 340.65 is: 470.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    620.42 : 856.14 = 340.65 : x
  2. Step 2: Convert to fraction form
    620.42/856.14 = 340.65/x
  3. Step 3: Cross multiply
    620.42x = 856.14 × 340.65
  4. Step 4: Simplify right side
    620.42x = 291,644.09
  5. Step 5: Solve for x
    x = 291,644.09/620.42
  6. Step 6: Final answer
    x = 470.08

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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.