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Finding the Fourth Proportional to 13,697.58, 18,910.80 and 8,990.10

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Solution

The fourth proportional to 13,697.58, 18,910.80 and 8,990.10 is: 12,411.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,697.58 : 18,910.80 = 8,990.10 : x
  2. Step 2: Convert to fraction form
    13,697.58/18,910.80 = 8,990.10/x
  3. Step 3: Cross multiply
    13,697.58x = 18,910.80 × 8,990.10
  4. Step 4: Simplify right side
    13,697.58x = 170,009,983.08
  5. Step 5: Solve for x
    x = 170,009,983.08/13,697.58
  6. Step 6: Final answer
    x = 12,411.68

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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.