Home / 21,203.40-31,805.68-5,621

Finding the Fourth Proportional to 21,203.40, 31,805.68 and 5,621

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Solution

The fourth proportional to 21,203.40, 31,805.68 and 5,621 is: 8,431.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,203.40 : 31,805.68 = 5,621 : x
  2. Step 2: Convert to fraction form
    21,203.40/31,805.68 = 5,621/x
  3. Step 3: Cross multiply
    21,203.40x = 31,805.68 × 5,621
  4. Step 4: Simplify right side
    21,203.40x = 178,779,727.28
  5. Step 5: Solve for x
    x = 178,779,727.28/21,203.40
  6. Step 6: Final answer
    x = 8,431.65

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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.