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Finding the Fourth Proportional to 20,905.60, 29,345.60 and 20,905.60

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Solution

The fourth proportional to 20,905.60, 29,345.60 and 20,905.60 is: 29,345.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,905.60 : 29,345.60 = 20,905.60 : x
  2. Step 2: Convert to fraction form
    20,905.60/29,345.60 = 20,905.60/x
  3. Step 3: Cross multiply
    20,905.60x = 29,345.60 × 20,905.60
  4. Step 4: Simplify right side
    20,905.60x = 613,487,375.36
  5. Step 5: Solve for x
    x = 613,487,375.36/20,905.60
  6. Step 6: Final answer
    x = 29,345.60

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.40) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.