Home / 21,180.79-31,749.02-7,135.96

Finding the Fourth Proportional to 21,180.79, 31,749.02 and 7,135.96

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Solution

The fourth proportional to 21,180.79, 31,749.02 and 7,135.96 is: 10,696.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,180.79 : 31,749.02 = 7,135.96 : x
  2. Step 2: Convert to fraction form
    21,180.79/31,749.02 = 7,135.96/x
  3. Step 3: Cross multiply
    21,180.79x = 31,749.02 × 7,135.96
  4. Step 4: Simplify right side
    21,180.79x = 226,559,820.14
  5. Step 5: Solve for x
    x = 226,559,820.14/21,180.79
  6. Step 6: Final answer
    x = 10,696.48

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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.