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Finding the Fourth Proportional to 555.32, 764.30 and 515.56

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Solution

The fourth proportional to 555.32, 764.30 and 515.56 is: 709.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    555.32 : 764.30 = 515.56 : x
  2. Step 2: Convert to fraction form
    555.32/764.30 = 515.56/x
  3. Step 3: Cross multiply
    555.32x = 764.30 × 515.56
  4. Step 4: Simplify right side
    555.32x = 394,042.51
  5. Step 5: Solve for x
    x = 394,042.51/555.32
  6. Step 6: Final answer
    x = 709.58

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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.