Home / 21,739.31-30,000.36-12,309.71

Finding the Fourth Proportional to 21,739.31, 30,000.36 and 12,309.71

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Solution

The fourth proportional to 21,739.31, 30,000.36 and 12,309.71 is: 16,987.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,739.31 : 30,000.36 = 12,309.71 : x
  2. Step 2: Convert to fraction form
    21,739.31/30,000.36 = 12,309.71/x
  3. Step 3: Cross multiply
    21,739.31x = 30,000.36 × 12,309.71
  4. Step 4: Simplify right side
    21,739.31x = 369,295,731.50
  5. Step 5: Solve for x
    x = 369,295,731.50/21,739.31
  6. Step 6: Final answer
    x = 16,987.46

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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.