Home / 20,720.90-31,081.12-12,403.24

Finding the Fourth Proportional to 20,720.90, 31,081.12 and 12,403.24

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Solution

The fourth proportional to 20,720.90, 31,081.12 and 12,403.24 is: 18,604.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,720.90 : 31,081.12 = 12,403.24 : x
  2. Step 2: Convert to fraction form
    20,720.90/31,081.12 = 12,403.24/x
  3. Step 3: Cross multiply
    20,720.90x = 31,081.12 × 12,403.24
  4. Step 4: Simplify right side
    20,720.90x = 385,506,590.83
  5. Step 5: Solve for x
    x = 385,506,590.83/20,720.90
  6. Step 6: Final answer
    x = 18,604.72

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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.