Home / 20,862.36-31,275.72-7,712.28

Finding the Fourth Proportional to 20,862.36, 31,275.72 and 7,712.28

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Solution

The fourth proportional to 20,862.36, 31,275.72 and 7,712.28 is: 11,561.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,862.36 : 31,275.72 = 7,712.28 : x
  2. Step 2: Convert to fraction form
    20,862.36/31,275.72 = 7,712.28/x
  3. Step 3: Cross multiply
    20,862.36x = 31,275.72 × 7,712.28
  4. Step 4: Simplify right side
    20,862.36x = 241,207,109.84
  5. Step 5: Solve for x
    x = 241,207,109.84/20,862.36
  6. Step 6: Final answer
    x = 11,561.83

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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.