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Finding the Fourth Proportional to 14,408, 21,636 and 13,330.40

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Solution

The fourth proportional to 14,408, 21,636 and 13,330.40 is: 20,017.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    14,408 : 21,636 = 13,330.40 : x
  2. Step 2: Convert to fraction form
    14,408/21,636 = 13,330.40/x
  3. Step 3: Cross multiply
    14,408x = 21,636 × 13,330.40
  4. Step 4: Simplify right side
    14,408x = 288,416,534.40
  5. Step 5: Solve for x
    x = 288,416,534.40/14,408
  6. Step 6: Final answer
    x = 20,017.80

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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.