Home / 12,621.40-18,915.90-11,228.20

Finding the Fourth Proportional to 12,621.40, 18,915.90 and 11,228.20

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Solution

The fourth proportional to 12,621.40, 18,915.90 and 11,228.20 is: 16,827.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,621.40 : 18,915.90 = 11,228.20 : x
  2. Step 2: Convert to fraction form
    12,621.40/18,915.90 = 11,228.20/x
  3. Step 3: Cross multiply
    12,621.40x = 18,915.90 × 11,228.20
  4. Step 4: Simplify right side
    12,621.40x = 212,391,508.38
  5. Step 5: Solve for x
    x = 212,391,508.38/12,621.40
  6. Step 6: Final answer
    x = 16,827.89

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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.