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Finding the Fourth Proportional to 28,008.60, 42,012.90 and 20,135.40

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Solution

The fourth proportional to 28,008.60, 42,012.90 and 20,135.40 is: 30,203.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,008.60 : 42,012.90 = 20,135.40 : x
  2. Step 2: Convert to fraction form
    28,008.60/42,012.90 = 20,135.40/x
  3. Step 3: Cross multiply
    28,008.60x = 42,012.90 × 20,135.40
  4. Step 4: Simplify right side
    28,008.60x = 845,946,546.66
  5. Step 5: Solve for x
    x = 845,946,546.66/28,008.60
  6. Step 6: Final answer
    x = 30,203.10

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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.