Home / 21,986.40-30,342.24-13,039.20

Finding the Fourth Proportional to 21,986.40, 30,342.24 and 13,039.20

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Solution

The fourth proportional to 21,986.40, 30,342.24 and 13,039.20 is: 17,994.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,986.40 : 30,342.24 = 13,039.20 : x
  2. Step 2: Convert to fraction form
    21,986.40/30,342.24 = 13,039.20/x
  3. Step 3: Cross multiply
    21,986.40x = 30,342.24 × 13,039.20
  4. Step 4: Simplify right side
    21,986.40x = 395,638,535.81
  5. Step 5: Solve for x
    x = 395,638,535.81/21,986.40
  6. Step 6: Final answer
    x = 17,994.69

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1.5x scale

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.