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Finding the Fourth Proportional to 20,160, 30,240 and 7,856.64

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Solution

The fourth proportional to 20,160, 30,240 and 7,856.64 is: 11,784.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,160 : 30,240 = 7,856.64 : x
  2. Step 2: Convert to fraction form
    20,160/30,240 = 7,856.64/x
  3. Step 3: Cross multiply
    20,160x = 30,240 × 7,856.64
  4. Step 4: Simplify right side
    20,160x = 237,584,793.60
  5. Step 5: Solve for x
    x = 237,584,793.60/20,160
  6. Step 6: Final answer
    x = 11,784.96

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.