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Finding the Fourth Proportional to 20,437.60, 28,203.12 and 11,485.60

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Solution

The fourth proportional to 20,437.60, 28,203.12 and 11,485.60 is: 15,849.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,437.60 : 28,203.12 = 11,485.60 : x
  2. Step 2: Convert to fraction form
    20,437.60/28,203.12 = 11,485.60/x
  3. Step 3: Cross multiply
    20,437.60x = 28,203.12 × 11,485.60
  4. Step 4: Simplify right side
    20,437.60x = 323,929,755.07
  5. Step 5: Solve for x
    x = 323,929,755.07/20,437.60
  6. Step 6: Final answer
    x = 15,849.70

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.