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Finding the Fourth Proportional to 19,428.68, 29,143.04 and 8,328.20

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Solution

The fourth proportional to 19,428.68, 29,143.04 and 8,328.20 is: 12,492.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    19,428.68 : 29,143.04 = 8,328.20 : x
  2. Step 2: Convert to fraction form
    19,428.68/29,143.04 = 8,328.20/x
  3. Step 3: Cross multiply
    19,428.68x = 29,143.04 × 8,328.20
  4. Step 4: Simplify right side
    19,428.68x = 242,709,065.73
  5. Step 5: Solve for x
    x = 242,709,065.73/19,428.68
  6. Step 6: Final answer
    x = 12,492.31

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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.