Home / 20,718.36-31,077.52-5,135.99

Finding the Fourth Proportional to 20,718.36, 31,077.52 and 5,135.99

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Solution

The fourth proportional to 20,718.36, 31,077.52 and 5,135.99 is: 7,703.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,718.36 : 31,077.52 = 5,135.99 : x
  2. Step 2: Convert to fraction form
    20,718.36/31,077.52 = 5,135.99/x
  3. Step 3: Cross multiply
    20,718.36x = 31,077.52 × 5,135.99
  4. Step 4: Simplify right side
    20,718.36x = 159,613,663.72
  5. Step 5: Solve for x
    x = 159,613,663.72/20,718.36
  6. Step 6: Final answer
    x = 7,703.97

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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.