Home / 21,157.90-31,736.85-8,669.40

Finding the Fourth Proportional to 21,157.90, 31,736.85 and 8,669.40

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Solution

The fourth proportional to 21,157.90, 31,736.85 and 8,669.40 is: 13,004.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,157.90 : 31,736.85 = 8,669.40 : x
  2. Step 2: Convert to fraction form
    21,157.90/31,736.85 = 8,669.40/x
  3. Step 3: Cross multiply
    21,157.90x = 31,736.85 × 8,669.40
  4. Step 4: Simplify right side
    21,157.90x = 275,139,404.04
  5. Step 5: Solve for x
    x = 275,139,404.04/21,157.90
  6. Step 6: Final answer
    x = 13,004.10

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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.