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Finding the Fourth Proportional to 20,991.50, 28,967.59 and 11,559.82

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Solution

The fourth proportional to 20,991.50, 28,967.59 and 11,559.82 is: 15,952.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,991.50 : 28,967.59 = 11,559.82 : x
  2. Step 2: Convert to fraction form
    20,991.50/28,967.59 = 11,559.82/x
  3. Step 3: Cross multiply
    20,991.50x = 28,967.59 × 11,559.82
  4. Step 4: Simplify right side
    20,991.50x = 334,860,126.23
  5. Step 5: Solve for x
    x = 334,860,126.23/20,991.50
  6. Step 6: Final answer
    x = 15,952.18

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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.