Home / 8,631.12-12,936.21-6,128.36

Finding the Fourth Proportional to 8,631.12, 12,936.21 and 6,128.36

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Solution

The fourth proportional to 8,631.12, 12,936.21 and 6,128.36 is: 9,185.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,631.12 : 12,936.21 = 6,128.36 : x
  2. Step 2: Convert to fraction form
    8,631.12/12,936.21 = 6,128.36/x
  3. Step 3: Cross multiply
    8,631.12x = 12,936.21 × 6,128.36
  4. Step 4: Simplify right side
    8,631.12x = 79,277,712.76
  5. Step 5: Solve for x
    x = 79,277,712.76/8,631.12
  6. Step 6: Final answer
    x = 9,185.10

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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.