Home / 21,101.80-29,126.24-13,139.32

Finding the Fourth Proportional to 21,101.80, 29,126.24 and 13,139.32

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Solution

The fourth proportional to 21,101.80, 29,126.24 and 13,139.32 is: 18,135.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,101.80 : 29,126.24 = 13,139.32 : x
  2. Step 2: Convert to fraction form
    21,101.80/29,126.24 = 13,139.32/x
  3. Step 3: Cross multiply
    21,101.80x = 29,126.24 × 13,139.32
  4. Step 4: Simplify right side
    21,101.80x = 382,698,898.52
  5. Step 5: Solve for x
    x = 382,698,898.52/21,101.80
  6. Step 6: Final answer
    x = 18,135.84

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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.