Home / 12,420.57-18,630.84-3,186.57

Finding the Fourth Proportional to 12,420.57, 18,630.84 and 3,186.57

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Solution

The fourth proportional to 12,420.57, 18,630.84 and 3,186.57 is: 4,779.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,420.57 : 18,630.84 = 3,186.57 : x
  2. Step 2: Convert to fraction form
    12,420.57/18,630.84 = 3,186.57/x
  3. Step 3: Cross multiply
    12,420.57x = 18,630.84 × 3,186.57
  4. Step 4: Simplify right side
    12,420.57x = 59,368,459.89
  5. Step 5: Solve for x
    x = 59,368,459.89/12,420.57
  6. Step 6: Final answer
    x = 4,779.85

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Similar ratio
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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.