Home / 12,415.20-17,135.78-9,721.14

Finding the Fourth Proportional to 12,415.20, 17,135.78 and 9,721.14

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Solution

The fourth proportional to 12,415.20, 17,135.78 and 9,721.14 is: 13,417.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,415.20 : 17,135.78 = 9,721.14 : x
  2. Step 2: Convert to fraction form
    12,415.20/17,135.78 = 9,721.14/x
  3. Step 3: Cross multiply
    12,415.20x = 17,135.78 × 9,721.14
  4. Step 4: Simplify right side
    12,415.20x = 166,579,316.39
  5. Step 5: Solve for x
    x = 166,579,316.39/12,415.20
  6. Step 6: Final answer
    x = 13,417.37

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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.