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Finding the Fourth Proportional to 620.38, 856.10 and 340.61

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Solution

The fourth proportional to 620.38, 856.10 and 340.61 is: 470.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    620.38 : 856.10 = 340.61 : x
  2. Step 2: Convert to fraction form
    620.38/856.10 = 340.61/x
  3. Step 3: Cross multiply
    620.38x = 856.10 × 340.61
  4. Step 4: Simplify right side
    620.38x = 291,592.79
  5. Step 5: Solve for x
    x = 291,592.79/620.38
  6. Step 6: Final answer
    x = 470.02

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Double scale
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1.5x scale

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.