Home / 8,421.72-12,630.87-2,872.06

Finding the Fourth Proportional to 8,421.72, 12,630.87 and 2,872.06

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Solution

The fourth proportional to 8,421.72, 12,630.87 and 2,872.06 is: 4,307.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,421.72 : 12,630.87 = 2,872.06 : x
  2. Step 2: Convert to fraction form
    8,421.72/12,630.87 = 2,872.06/x
  3. Step 3: Cross multiply
    8,421.72x = 12,630.87 × 2,872.06
  4. Step 4: Simplify right side
    8,421.72x = 36,276,616.49
  5. Step 5: Solve for x
    x = 36,276,616.49/8,421.72
  6. Step 6: Final answer
    x = 4,307.51

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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.