Home / 12,678.21-19,034.55-7,135.45

Finding the Fourth Proportional to 12,678.21, 19,034.55 and 7,135.45

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Solution

The fourth proportional to 12,678.21, 19,034.55 and 7,135.45 is: 10,712.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,678.21 : 19,034.55 = 7,135.45 : x
  2. Step 2: Convert to fraction form
    12,678.21/19,034.55 = 7,135.45/x
  3. Step 3: Cross multiply
    12,678.21x = 19,034.55 × 7,135.45
  4. Step 4: Simplify right side
    12,678.21x = 135,820,032.21
  5. Step 5: Solve for x
    x = 135,820,032.21/12,678.21
  6. Step 6: Final answer
    x = 10,712.87

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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.