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Finding the Fourth Proportional to 513.37, 770.04 and 128.62

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Solution

The fourth proportional to 513.37, 770.04 and 128.62 is: 192.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    513.37 : 770.04 = 128.62 : x
  2. Step 2: Convert to fraction form
    513.37/770.04 = 128.62/x
  3. Step 3: Cross multiply
    513.37x = 770.04 × 128.62
  4. Step 4: Simplify right side
    513.37x = 99,038.69
  5. Step 5: Solve for x
    x = 99,038.69/513.37
  6. Step 6: Final answer
    x = 192.92

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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.