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Finding the Fourth Proportional to 20,657.72, 28,506.72 and 11,705.04

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Solution

The fourth proportional to 20,657.72, 28,506.72 and 11,705.04 is: 16,152.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,657.72 : 28,506.72 = 11,705.04 : x
  2. Step 2: Convert to fraction form
    20,657.72/28,506.72 = 11,705.04/x
  3. Step 3: Cross multiply
    20,657.72x = 28,506.72 × 11,705.04
  4. Step 4: Simplify right side
    20,657.72x = 333,672,297.87
  5. Step 5: Solve for x
    x = 333,672,297.87/20,657.72
  6. Step 6: Final answer
    x = 16,152.43

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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.