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Finding the Fourth Proportional to 620.52, 856.31 and 340.75

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Solution

The fourth proportional to 620.52, 856.31 and 340.75 is: 470.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    620.52 : 856.31 = 340.75 : x
  2. Step 2: Convert to fraction form
    620.52/856.31 = 340.75/x
  3. Step 3: Cross multiply
    620.52x = 856.31 × 340.75
  4. Step 4: Simplify right side
    620.52x = 291,787.63
  5. Step 5: Solve for x
    x = 291,787.63/620.52
  6. Step 6: Final answer
    x = 470.23

Related Problems

Find fourth proportional to 310.26, 428.16 and 170.38
Half scale
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Double scale
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Similar ratio
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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.