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Finding the Fourth Proportional to 513.25, 770.16 and 256.75

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Solution

The fourth proportional to 513.25, 770.16 and 256.75 is: 385.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    513.25 : 770.16 = 256.75 : x
  2. Step 2: Convert to fraction form
    513.25/770.16 = 256.75/x
  3. Step 3: Cross multiply
    513.25x = 770.16 × 256.75
  4. Step 4: Simplify right side
    513.25x = 197,738.58
  5. Step 5: Solve for x
    x = 197,738.58/513.25
  6. Step 6: Final answer
    x = 385.27

Related Problems

Find fourth proportional to 256.63, 385.08 and 128.38
Half scale
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Double scale
Find fourth proportional to 514.25, 771.66 and 257.75
Similar ratio
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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.