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Finding the Fourth Proportional to 20,152.60, 30,221.70 and 7,005.40

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Solution

The fourth proportional to 20,152.60, 30,221.70 and 7,005.40 is: 10,505.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,152.60 : 30,221.70 = 7,005.40 : x
  2. Step 2: Convert to fraction form
    20,152.60/30,221.70 = 7,005.40/x
  3. Step 3: Cross multiply
    20,152.60x = 30,221.70 × 7,005.40
  4. Step 4: Simplify right side
    20,152.60x = 211,715,097.18
  5. Step 5: Solve for x
    x = 211,715,097.18/20,152.60
  6. Step 6: Final answer
    x = 10,505.60

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1.5x scale

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.