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Finding the Fourth Proportional to 620.61, 856.43 and 340.84

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Solution

The fourth proportional to 620.61, 856.43 and 340.84 is: 470.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    620.61 : 856.43 = 340.84 : x
  2. Step 2: Convert to fraction form
    620.61/856.43 = 340.84/x
  3. Step 3: Cross multiply
    620.61x = 856.43 × 340.84
  4. Step 4: Simplify right side
    620.61x = 291,901.32
  5. Step 5: Solve for x
    x = 291,901.32/620.61
  6. Step 6: Final answer
    x = 470.35

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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.