Home / 12,911.04-19,366.08-7,989.12

Finding the Fourth Proportional to 12,911.04, 19,366.08 and 7,989.12

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Solution

The fourth proportional to 12,911.04, 19,366.08 and 7,989.12 is: 11,983.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,911.04 : 19,366.08 = 7,989.12 : x
  2. Step 2: Convert to fraction form
    12,911.04/19,366.08 = 7,989.12/x
  3. Step 3: Cross multiply
    12,911.04x = 19,366.08 × 7,989.12
  4. Step 4: Simplify right side
    12,911.04x = 154,717,937.05
  5. Step 5: Solve for x
    x = 154,717,937.05/12,911.04
  6. Step 6: Final answer
    x = 11,983.38

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Double scale
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Similar ratio
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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.