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Finding the Fourth Proportional to 20,657.65, 28,507.79 and 11,226.21

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Solution

The fourth proportional to 20,657.65, 28,507.79 and 11,226.21 is: 15,492.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,657.65 : 28,507.79 = 11,226.21 : x
  2. Step 2: Convert to fraction form
    20,657.65/28,507.79 = 11,226.21/x
  3. Step 3: Cross multiply
    20,657.65x = 28,507.79 × 11,226.21
  4. Step 4: Simplify right side
    20,657.65x = 320,034,381.04
  5. Step 5: Solve for x
    x = 320,034,381.04/20,657.65
  6. Step 6: Final answer
    x = 15,492.30

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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.