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Finding the Fourth Proportional to 20,990, 28,965.52 and 11,558.32

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Solution

The fourth proportional to 20,990, 28,965.52 and 11,558.32 is: 15,950.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,990 : 28,965.52 = 11,558.32 : x
  2. Step 2: Convert to fraction form
    20,990/28,965.52 = 11,558.32/x
  3. Step 3: Cross multiply
    20,990x = 28,965.52 × 11,558.32
  4. Step 4: Simplify right side
    20,990x = 334,792,749.13
  5. Step 5: Solve for x
    x = 334,792,749.13/20,990
  6. Step 6: Final answer
    x = 15,950.11

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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.