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Finding the Fourth Proportional to 513.72, 770.39 and 253.63

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Solution

The fourth proportional to 513.72, 770.39 and 253.63 is: 380.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    513.72 : 770.39 = 253.63 : x
  2. Step 2: Convert to fraction form
    513.72/770.39 = 253.63/x
  3. Step 3: Cross multiply
    513.72x = 770.39 × 253.63
  4. Step 4: Simplify right side
    513.72x = 195,393.95
  5. Step 5: Solve for x
    x = 195,393.95/513.72
  6. Step 6: Final answer
    x = 380.35

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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.