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Finding the Fourth Proportional to 12,998.80, 19,498.20 and 3,138.04

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Solution

The fourth proportional to 12,998.80, 19,498.20 and 3,138.04 is: 4,707.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,998.80 : 19,498.20 = 3,138.04 : x
  2. Step 2: Convert to fraction form
    12,998.80/19,498.20 = 3,138.04/x
  3. Step 3: Cross multiply
    12,998.80x = 19,498.20 × 3,138.04
  4. Step 4: Simplify right side
    12,998.80x = 61,186,131.53
  5. Step 5: Solve for x
    x = 61,186,131.53/12,998.80
  6. Step 6: Final answer
    x = 4,707.06

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Half scale
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Double scale
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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.