Home / 21,318.12-31,973.40-12,542.76

Finding the Fourth Proportional to 21,318.12, 31,973.40 and 12,542.76

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Solution

The fourth proportional to 21,318.12, 31,973.40 and 12,542.76 is: 18,811.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,318.12 : 31,973.40 = 12,542.76 : x
  2. Step 2: Convert to fraction form
    21,318.12/31,973.40 = 12,542.76/x
  3. Step 3: Cross multiply
    21,318.12x = 31,973.40 × 12,542.76
  4. Step 4: Simplify right side
    21,318.12x = 401,034,682.58
  5. Step 5: Solve for x
    x = 401,034,682.58/21,318.12
  6. Step 6: Final answer
    x = 18,811.92

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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.