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Finding the Fourth Proportional to 20,990.56, 28,967.04 and 11,559.68

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Solution

The fourth proportional to 20,990.56, 28,967.04 and 11,559.68 is: 15,952.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,990.56 : 28,967.04 = 11,559.68 : x
  2. Step 2: Convert to fraction form
    20,990.56/28,967.04 = 11,559.68/x
  3. Step 3: Cross multiply
    20,990.56x = 28,967.04 × 11,559.68
  4. Step 4: Simplify right side
    20,990.56x = 334,849,712.95
  5. Step 5: Solve for x
    x = 334,849,712.95/20,990.56
  6. Step 6: Final answer
    x = 15,952.40

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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.