Home / 21,128.90-31,654.35-18,324.08

Finding the Fourth Proportional to 21,128.90, 31,654.35 and 18,324.08

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Solution

The fourth proportional to 21,128.90, 31,654.35 and 18,324.08 is: 27,452.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,128.90 : 31,654.35 = 18,324.08 : x
  2. Step 2: Convert to fraction form
    21,128.90/31,654.35 = 18,324.08/x
  3. Step 3: Cross multiply
    21,128.90x = 31,654.35 × 18,324.08
  4. Step 4: Simplify right side
    21,128.90x = 580,036,683.48
  5. Step 5: Solve for x
    x = 580,036,683.48/21,128.90
  6. Step 6: Final answer
    x = 27,452.30

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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.