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Finding the Fourth Proportional to 20,957.52, 28,920.81 and 11,526.09

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Solution

The fourth proportional to 20,957.52, 28,920.81 and 11,526.09 is: 15,905.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,957.52 : 28,920.81 = 11,526.09 : x
  2. Step 2: Convert to fraction form
    20,957.52/28,920.81 = 11,526.09/x
  3. Step 3: Cross multiply
    20,957.52x = 28,920.81 × 11,526.09
  4. Step 4: Simplify right side
    20,957.52x = 333,343,858.93
  5. Step 5: Solve for x
    x = 333,343,858.93/20,957.52
  6. Step 6: Final answer
    x = 15,905.69

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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.