Home / 21,420.86-29,558.12-11,987.06

Finding the Fourth Proportional to 21,420.86, 29,558.12 and 11,987.06

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Solution

The fourth proportional to 21,420.86, 29,558.12 and 11,987.06 is: 16,540.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,420.86 : 29,558.12 = 11,987.06 : x
  2. Step 2: Convert to fraction form
    21,420.86/29,558.12 = 11,987.06/x
  3. Step 3: Cross multiply
    21,420.86x = 29,558.12 × 11,987.06
  4. Step 4: Simplify right side
    21,420.86x = 354,314,957.93
  5. Step 5: Solve for x
    x = 354,314,957.93/21,420.86
  6. Step 6: Final answer
    x = 16,540.65

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.