Home / 20,812.98-28,720.88-12,317.64

Finding the Fourth Proportional to 20,812.98, 28,720.88 and 12,317.64

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Solution

The fourth proportional to 20,812.98, 28,720.88 and 12,317.64 is: 16,997.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,812.98 : 28,720.88 = 12,317.64 : x
  2. Step 2: Convert to fraction form
    20,812.98/28,720.88 = 12,317.64/x
  3. Step 3: Cross multiply
    20,812.98x = 28,720.88 × 12,317.64
  4. Step 4: Simplify right side
    20,812.98x = 353,773,337.22
  5. Step 5: Solve for x
    x = 353,773,337.22/20,812.98
  6. Step 6: Final answer
    x = 16,997.72

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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.