Home / 21,278.77-29,301.30-20,806.72

Finding the Fourth Proportional to 21,278.77, 29,301.30 and 20,806.72

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Solution

The fourth proportional to 21,278.77, 29,301.30 and 20,806.72 is: 28,651.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,278.77 : 29,301.30 = 20,806.72 : x
  2. Step 2: Convert to fraction form
    21,278.77/29,301.30 = 20,806.72/x
  3. Step 3: Cross multiply
    21,278.77x = 29,301.30 × 20,806.72
  4. Step 4: Simplify right side
    21,278.77x = 609,663,944.74
  5. Step 5: Solve for x
    x = 609,663,944.74/21,278.77
  6. Step 6: Final answer
    x = 28,651.28

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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.