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Finding the Fourth Proportional to 20,458.80, 30,611.40 and 18,615.60

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Solution

The fourth proportional to 20,458.80, 30,611.40 and 18,615.60 is: 27,853.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,458.80 : 30,611.40 = 18,615.60 : x
  2. Step 2: Convert to fraction form
    20,458.80/30,611.40 = 18,615.60/x
  3. Step 3: Cross multiply
    20,458.80x = 30,611.40 × 18,615.60
  4. Step 4: Simplify right side
    20,458.80x = 569,849,577.84
  5. Step 5: Solve for x
    x = 569,849,577.84/20,458.80
  6. Step 6: Final answer
    x = 27,853.52

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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.