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Finding the Fourth Proportional to 515.64, 768.57 and 485.69

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Solution

The fourth proportional to 515.64, 768.57 and 485.69 is: 723.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    515.64 : 768.57 = 485.69 : x
  2. Step 2: Convert to fraction form
    515.64/768.57 = 485.69/x
  3. Step 3: Cross multiply
    515.64x = 768.57 × 485.69
  4. Step 4: Simplify right side
    515.64x = 373,286.76
  5. Step 5: Solve for x
    x = 373,286.76/515.64
  6. Step 6: Final answer
    x = 723.93

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.