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Finding the Fourth Proportional to 259,530.30, 389,315.82 and 69,987.81

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Solution

The fourth proportional to 259,530.30, 389,315.82 and 69,987.81 is: 104,987.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    259,530.30 : 389,315.82 = 69,987.81 : x
  2. Step 2: Convert to fraction form
    259,530.30/389,315.82 = 69,987.81/x
  3. Step 3: Cross multiply
    259,530.30x = 389,315.82 × 69,987.81
  4. Step 4: Simplify right side
    259,530.30x = 27,247,361,640.15
  5. Step 5: Solve for x
    x = 27,247,361,640.15/259,530.30
  6. Step 6: Final answer
    x = 104,987.21

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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.