Home / 20,707.97-31,061.81-12,390.31

Finding the Fourth Proportional to 20,707.97, 31,061.81 and 12,390.31

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Solution

The fourth proportional to 20,707.97, 31,061.81 and 12,390.31 is: 18,585.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,707.97 : 31,061.81 = 12,390.31 : x
  2. Step 2: Convert to fraction form
    20,707.97/31,061.81 = 12,390.31/x
  3. Step 3: Cross multiply
    20,707.97x = 31,061.81 × 12,390.31
  4. Step 4: Simplify right side
    20,707.97x = 384,865,408.38
  5. Step 5: Solve for x
    x = 384,865,408.38/20,707.97
  6. Step 6: Final answer
    x = 18,585.37

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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.