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Finding the Fourth Proportional to 20,992.52, 28,971.32 and 11,562.76

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Solution

The fourth proportional to 20,992.52, 28,971.32 and 11,562.76 is: 15,957.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,992.52 : 28,971.32 = 11,562.76 : x
  2. Step 2: Convert to fraction form
    20,992.52/28,971.32 = 11,562.76/x
  3. Step 3: Cross multiply
    20,992.52x = 28,971.32 × 11,562.76
  4. Step 4: Simplify right side
    20,992.52x = 334,988,420.04
  5. Step 5: Solve for x
    x = 334,988,420.04/20,992.52
  6. Step 6: Final answer
    x = 15,957.51

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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.