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Finding the Fourth Proportional to 21,008, 28,990.72 and 11,576.32

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Solution

The fourth proportional to 21,008, 28,990.72 and 11,576.32 is: 15,975.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,008 : 28,990.72 = 11,576.32 : x
  2. Step 2: Convert to fraction form
    21,008/28,990.72 = 11,576.32/x
  3. Step 3: Cross multiply
    21,008x = 28,990.72 × 11,576.32
  4. Step 4: Simplify right side
    21,008x = 335,605,851.75
  5. Step 5: Solve for x
    x = 335,605,851.75/21,008
  6. Step 6: Final answer
    x = 15,975.15

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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.