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Finding the Fourth Proportional to 1,391.05, 2,086.80 and 525.43

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Solution

The fourth proportional to 1,391.05, 2,086.80 and 525.43 is: 788.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,391.05 : 2,086.80 = 525.43 : x
  2. Step 2: Convert to fraction form
    1,391.05/2,086.80 = 525.43/x
  3. Step 3: Cross multiply
    1,391.05x = 2,086.80 × 525.43
  4. Step 4: Simplify right side
    1,391.05x = 1,096,467.32
  5. Step 5: Solve for x
    x = 1,096,467.32/1,391.05
  6. Step 6: Final answer
    x = 788.23

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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.