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Finding the Fourth Proportional to 13,420.45, 18,520.86 and 7,755.95

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Solution

The fourth proportional to 13,420.45, 18,520.86 and 7,755.95 is: 10,703.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,420.45 : 18,520.86 = 7,755.95 : x
  2. Step 2: Convert to fraction form
    13,420.45/18,520.86 = 7,755.95/x
  3. Step 3: Cross multiply
    13,420.45x = 18,520.86 × 7,755.95
  4. Step 4: Simplify right side
    13,420.45x = 143,646,864.12
  5. Step 5: Solve for x
    x = 143,646,864.12/13,420.45
  6. Step 6: Final answer
    x = 10,703.58

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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.