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Finding the Fourth Proportional to 20,988.52, 28,964.16 and 11,557.09

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Solution

The fourth proportional to 20,988.52, 28,964.16 and 11,557.09 is: 15,948.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,988.52 : 28,964.16 = 11,557.09 : x
  2. Step 2: Convert to fraction form
    20,988.52/28,964.16 = 11,557.09/x
  3. Step 3: Cross multiply
    20,988.52x = 28,964.16 × 11,557.09
  4. Step 4: Simplify right side
    20,988.52x = 334,741,403.89
  5. Step 5: Solve for x
    x = 334,741,403.89/20,988.52
  6. Step 6: Final answer
    x = 15,948.79

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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.