Home / 21,991.52-30,340.74-12,430.28

Finding the Fourth Proportional to 21,991.52, 30,340.74 and 12,430.28

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Solution

The fourth proportional to 21,991.52, 30,340.74 and 12,430.28 is: 17,149.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,991.52 : 30,340.74 = 12,430.28 : x
  2. Step 2: Convert to fraction form
    21,991.52/30,340.74 = 12,430.28/x
  3. Step 3: Cross multiply
    21,991.52x = 30,340.74 × 12,430.28
  4. Step 4: Simplify right side
    21,991.52x = 377,143,893.61
  5. Step 5: Solve for x
    x = 377,143,893.61/21,991.52
  6. Step 6: Final answer
    x = 17,149.51

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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.