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Finding the Fourth Proportional to 14,035.20, 20,953.20 and 12,480

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Solution

The fourth proportional to 14,035.20, 20,953.20 and 12,480 is: 18,631.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    14,035.20 : 20,953.20 = 12,480 : x
  2. Step 2: Convert to fraction form
    14,035.20/20,953.20 = 12,480/x
  3. Step 3: Cross multiply
    14,035.20x = 20,953.20 × 12,480
  4. Step 4: Simplify right side
    14,035.20x = 261,495,936
  5. Step 5: Solve for x
    x = 261,495,936/14,035.20
  6. Step 6: Final answer
    x = 18,631.44

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.