Home / 21,238.80-29,309.64-13,285.68

Finding the Fourth Proportional to 21,238.80, 29,309.64 and 13,285.68

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Solution

The fourth proportional to 21,238.80, 29,309.64 and 13,285.68 is: 18,334.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,238.80 : 29,309.64 = 13,285.68 : x
  2. Step 2: Convert to fraction form
    21,238.80/29,309.64 = 13,285.68/x
  3. Step 3: Cross multiply
    21,238.80x = 29,309.64 × 13,285.68
  4. Step 4: Simplify right side
    21,238.80x = 389,398,497.96
  5. Step 5: Solve for x
    x = 389,398,497.96/21,238.80
  6. Step 6: Final answer
    x = 18,334.30

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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.