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Finding the Fourth Proportional to 13,420.94, 18,520.88 and 7,453.50

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Solution

The fourth proportional to 13,420.94, 18,520.88 and 7,453.50 is: 10,285.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,420.94 : 18,520.88 = 7,453.50 : x
  2. Step 2: Convert to fraction form
    13,420.94/18,520.88 = 7,453.50/x
  3. Step 3: Cross multiply
    13,420.94x = 18,520.88 × 7,453.50
  4. Step 4: Simplify right side
    13,420.94x = 138,045,379.08
  5. Step 5: Solve for x
    x = 138,045,379.08/13,420.94
  6. Step 6: Final answer
    x = 10,285.82

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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.