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Finding the Fourth Proportional to 20,636.16, 28,478.16 and 11,204.88

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Solution

The fourth proportional to 20,636.16, 28,478.16 and 11,204.88 is: 15,462.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,636.16 : 28,478.16 = 11,204.88 : x
  2. Step 2: Convert to fraction form
    20,636.16/28,478.16 = 11,204.88/x
  3. Step 3: Cross multiply
    20,636.16x = 28,478.16 × 11,204.88
  4. Step 4: Simplify right side
    20,636.16x = 319,094,365.42
  5. Step 5: Solve for x
    x = 319,094,365.42/20,636.16
  6. Step 6: Final answer
    x = 15,462.88

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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.