Home / 20,969.79-31,406.07-12,631.59

Finding the Fourth Proportional to 20,969.79, 31,406.07 and 12,631.59

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Solution

The fourth proportional to 20,969.79, 31,406.07 and 12,631.59 is: 18,918.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,969.79 : 31,406.07 = 12,631.59 : x
  2. Step 2: Convert to fraction form
    20,969.79/31,406.07 = 12,631.59/x
  3. Step 3: Cross multiply
    20,969.79x = 31,406.07 × 12,631.59
  4. Step 4: Simplify right side
    20,969.79x = 396,708,442.72
  5. Step 5: Solve for x
    x = 396,708,442.72/20,969.79
  6. Step 6: Final answer
    x = 18,918.10

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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.