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Finding the Fourth Proportional to 20,658.60, 28,999.80 and 20,658.60

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Solution

The fourth proportional to 20,658.60, 28,999.80 and 20,658.60 is: 28,999.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,658.60 : 28,999.80 = 20,658.60 : x
  2. Step 2: Convert to fraction form
    20,658.60/28,999.80 = 20,658.60/x
  3. Step 3: Cross multiply
    20,658.60x = 28,999.80 × 20,658.60
  4. Step 4: Simplify right side
    20,658.60x = 599,095,268.28
  5. Step 5: Solve for x
    x = 599,095,268.28/20,658.60
  6. Step 6: Final answer
    x = 28,999.80

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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.