Home / 12,428.40-18,630.45-11,116.20

Finding the Fourth Proportional to 12,428.40, 18,630.45 and 11,116.20

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Solution

The fourth proportional to 12,428.40, 18,630.45 and 11,116.20 is: 16,663.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,428.40 : 18,630.45 = 11,116.20 : x
  2. Step 2: Convert to fraction form
    12,428.40/18,630.45 = 11,116.20/x
  3. Step 3: Cross multiply
    12,428.40x = 18,630.45 × 11,116.20
  4. Step 4: Simplify right side
    12,428.40x = 207,099,808.29
  5. Step 5: Solve for x
    x = 207,099,808.29/12,428.40
  6. Step 6: Final answer
    x = 16,663.43

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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.