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Finding the Fourth Proportional to 20,714.84, 28,572.04 and 15,662.87

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Solution

The fourth proportional to 20,714.84, 28,572.04 and 15,662.87 is: 21,603.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,714.84 : 28,572.04 = 15,662.87 : x
  2. Step 2: Convert to fraction form
    20,714.84/28,572.04 = 15,662.87/x
  3. Step 3: Cross multiply
    20,714.84x = 28,572.04 × 15,662.87
  4. Step 4: Simplify right side
    20,714.84x = 447,520,148.15
  5. Step 5: Solve for x
    x = 447,520,148.15/20,714.84
  6. Step 6: Final answer
    x = 21,603.84

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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.