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Finding the Fourth Proportional to 20,991, 28,967.58 and 11,559.54

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Solution

The fourth proportional to 20,991, 28,967.58 and 11,559.54 is: 15,952.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,991 : 28,967.58 = 11,559.54 : x
  2. Step 2: Convert to fraction form
    20,991/28,967.58 = 11,559.54/x
  3. Step 3: Cross multiply
    20,991x = 28,967.58 × 11,559.54
  4. Step 4: Simplify right side
    20,991x = 334,851,899.71
  5. Step 5: Solve for x
    x = 334,851,899.71/20,991
  6. Step 6: Final answer
    x = 15,952.17

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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.