Home / 13,137.21-18,117.54-8,420.58

Finding the Fourth Proportional to 13,137.21, 18,117.54 and 8,420.58

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Solution

The fourth proportional to 13,137.21, 18,117.54 and 8,420.58 is: 11,612.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,137.21 : 18,117.54 = 8,420.58 : x
  2. Step 2: Convert to fraction form
    13,137.21/18,117.54 = 8,420.58/x
  3. Step 3: Cross multiply
    13,137.21x = 18,117.54 × 8,420.58
  4. Step 4: Simplify right side
    13,137.21x = 152,560,194.97
  5. Step 5: Solve for x
    x = 152,560,194.97/13,137.21
  6. Step 6: Final answer
    x = 11,612.83

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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.