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Finding the Fourth Proportional to 561.76, 775.20 and 512.80

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Solution

The fourth proportional to 561.76, 775.20 and 512.80 is: 707.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    561.76 : 775.20 = 512.80 : x
  2. Step 2: Convert to fraction form
    561.76/775.20 = 512.80/x
  3. Step 3: Cross multiply
    561.76x = 775.20 × 512.80
  4. Step 4: Simplify right side
    561.76x = 397,522.56
  5. Step 5: Solve for x
    x = 397,522.56/561.76
  6. Step 6: Final answer
    x = 707.64

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.