Home / 21,155.31-31,732.96-8,681.21

Finding the Fourth Proportional to 21,155.31, 31,732.96 and 8,681.21

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Solution

The fourth proportional to 21,155.31, 31,732.96 and 8,681.21 is: 13,021.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,155.31 : 31,732.96 = 8,681.21 : x
  2. Step 2: Convert to fraction form
    21,155.31/31,732.96 = 8,681.21/x
  3. Step 3: Cross multiply
    21,155.31x = 31,732.96 × 8,681.21
  4. Step 4: Simplify right side
    21,155.31x = 275,480,287.61
  5. Step 5: Solve for x
    x = 275,480,287.61/21,155.31
  6. Step 6: Final answer
    x = 13,021.81

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1.5x scale

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.