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Finding the Fourth Proportional to 525.86, 725.69 and 289.81

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Solution

The fourth proportional to 525.86, 725.69 and 289.81 is: 399.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    525.86 : 725.69 = 289.81 : x
  2. Step 2: Convert to fraction form
    525.86/725.69 = 289.81/x
  3. Step 3: Cross multiply
    525.86x = 725.69 × 289.81
  4. Step 4: Simplify right side
    525.86x = 210,308.96
  5. Step 5: Solve for x
    x = 210,308.96/525.86
  6. Step 6: Final answer
    x = 399.94

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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.