Home / 12,991.36-17,928.48-7,402

Finding the Fourth Proportional to 12,991.36, 17,928.48 and 7,402

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Solution

The fourth proportional to 12,991.36, 17,928.48 and 7,402 is: 10,214.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,991.36 : 17,928.48 = 7,402 : x
  2. Step 2: Convert to fraction form
    12,991.36/17,928.48 = 7,402/x
  3. Step 3: Cross multiply
    12,991.36x = 17,928.48 × 7,402
  4. Step 4: Simplify right side
    12,991.36x = 132,706,608.96
  5. Step 5: Solve for x
    x = 132,706,608.96/12,991.36
  6. Step 6: Final answer
    x = 10,214.99

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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.