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Finding the Fourth Proportional to 513, 769.60 and 256.50

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Solution

The fourth proportional to 513, 769.60 and 256.50 is: 384.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    513 : 769.60 = 256.50 : x
  2. Step 2: Convert to fraction form
    513/769.60 = 256.50/x
  3. Step 3: Cross multiply
    513x = 769.60 × 256.50
  4. Step 4: Simplify right side
    513x = 197,402.40
  5. Step 5: Solve for x
    x = 197,402.40/513
  6. Step 6: Final answer
    x = 384.80

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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.