Home / 21,138.30-29,111.81-20,679.03

Finding the Fourth Proportional to 21,138.30, 29,111.81 and 20,679.03

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Solution

The fourth proportional to 21,138.30, 29,111.81 and 20,679.03 is: 28,479.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,138.30 : 29,111.81 = 20,679.03 : x
  2. Step 2: Convert to fraction form
    21,138.30/29,111.81 = 20,679.03/x
  3. Step 3: Cross multiply
    21,138.30x = 29,111.81 × 20,679.03
  4. Step 4: Simplify right side
    21,138.30x = 602,003,888.95
  5. Step 5: Solve for x
    x = 602,003,888.95/21,138.30
  6. Step 6: Final answer
    x = 28,479.30

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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.