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Finding the Fourth Proportional to 13,455.90, 20,187.90 and 7,218.90

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Solution

The fourth proportional to 13,455.90, 20,187.90 and 7,218.90 is: 10,830.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,455.90 : 20,187.90 = 7,218.90 : x
  2. Step 2: Convert to fraction form
    13,455.90/20,187.90 = 7,218.90/x
  3. Step 3: Cross multiply
    13,455.90x = 20,187.90 × 7,218.90
  4. Step 4: Simplify right side
    13,455.90x = 145,734,431.31
  5. Step 5: Solve for x
    x = 145,734,431.31/13,455.90
  6. Step 6: Final answer
    x = 10,830.52

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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.