Home / 12,939.35-17,855.64-7,911.95

Finding the Fourth Proportional to 12,939.35, 17,855.64 and 7,911.95

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Solution

The fourth proportional to 12,939.35, 17,855.64 and 7,911.95 is: 10,918.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,939.35 : 17,855.64 = 7,911.95 : x
  2. Step 2: Convert to fraction form
    12,939.35/17,855.64 = 7,911.95/x
  3. Step 3: Cross multiply
    12,939.35x = 17,855.64 × 7,911.95
  4. Step 4: Simplify right side
    12,939.35x = 141,272,841.62
  5. Step 5: Solve for x
    x = 141,272,841.62/12,939.35
  6. Step 6: Final answer
    x = 10,918.08

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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.