Home / 21,628.80-29,853.12-13,131.84

Finding the Fourth Proportional to 21,628.80, 29,853.12 and 13,131.84

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Solution

The fourth proportional to 21,628.80, 29,853.12 and 13,131.84 is: 18,125.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,628.80 : 29,853.12 = 13,131.84 : x
  2. Step 2: Convert to fraction form
    21,628.80/29,853.12 = 13,131.84/x
  3. Step 3: Cross multiply
    21,628.80x = 29,853.12 × 13,131.84
  4. Step 4: Simplify right side
    21,628.80x = 392,026,395.34
  5. Step 5: Solve for x
    x = 392,026,395.34/21,628.80
  6. Step 6: Final answer
    x = 18,125.20

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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.