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Finding the Fourth Proportional to 12,428.55, 18,642.81 and 8,521.11

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Solution

The fourth proportional to 12,428.55, 18,642.81 and 8,521.11 is: 12,781.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,428.55 : 18,642.81 = 8,521.11 : x
  2. Step 2: Convert to fraction form
    12,428.55/18,642.81 = 8,521.11/x
  3. Step 3: Cross multiply
    12,428.55x = 18,642.81 × 8,521.11
  4. Step 4: Simplify right side
    12,428.55x = 158,857,434.72
  5. Step 5: Solve for x
    x = 158,857,434.72/12,428.55
  6. Step 6: Final answer
    x = 12,781.65

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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.