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Finding the Fourth Proportional to 525.05, 786.81 and 387.75

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Solution

The fourth proportional to 525.05, 786.81 and 387.75 is: 581.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    525.05 : 786.81 = 387.75 : x
  2. Step 2: Convert to fraction form
    525.05/786.81 = 387.75/x
  3. Step 3: Cross multiply
    525.05x = 786.81 × 387.75
  4. Step 4: Simplify right side
    525.05x = 305,089.98
  5. Step 5: Solve for x
    x = 305,089.98/525.05
  6. Step 6: Final answer
    x = 581.07

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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.