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Finding the Fourth Proportional to 13,420.31, 18,520.11 and 7,755.08

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Solution

The fourth proportional to 13,420.31, 18,520.11 and 7,755.08 is: 10,702.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,420.31 : 18,520.11 = 7,755.08 : x
  2. Step 2: Convert to fraction form
    13,420.31/18,520.11 = 7,755.08/x
  3. Step 3: Cross multiply
    13,420.31x = 18,520.11 × 7,755.08
  4. Step 4: Simplify right side
    13,420.31x = 143,624,842.06
  5. Step 5: Solve for x
    x = 143,624,842.06/13,420.31
  6. Step 6: Final answer
    x = 10,702.05

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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.