Home / 20,964.22-28,920.95-13,406.77

Finding the Fourth Proportional to 20,964.22, 28,920.95 and 13,406.77

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Solution

The fourth proportional to 20,964.22, 28,920.95 and 13,406.77 is: 18,495.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,964.22 : 28,920.95 = 13,406.77 : x
  2. Step 2: Convert to fraction form
    20,964.22/28,920.95 = 13,406.77/x
  3. Step 3: Cross multiply
    20,964.22x = 28,920.95 × 13,406.77
  4. Step 4: Simplify right side
    20,964.22x = 387,736,381.54
  5. Step 5: Solve for x
    x = 387,736,381.54/20,964.22
  6. Step 6: Final answer
    x = 18,495.15

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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.