Home / 18,421.39-25,431.18-12,403.31

Finding the Fourth Proportional to 18,421.39, 25,431.18 and 12,403.31

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Solution

The fourth proportional to 18,421.39, 25,431.18 and 12,403.31 is: 17,123.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,421.39 : 25,431.18 = 12,403.31 : x
  2. Step 2: Convert to fraction form
    18,421.39/25,431.18 = 12,403.31/x
  3. Step 3: Cross multiply
    18,421.39x = 25,431.18 × 12,403.31
  4. Step 4: Simplify right side
    18,421.39x = 315,430,809.21
  5. Step 5: Solve for x
    x = 315,430,809.21/18,421.39
  6. Step 6: Final answer
    x = 17,123.07

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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.