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Finding the Fourth Proportional to 13,691.50, 18,894.28 and 7,403.88

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Solution

The fourth proportional to 13,691.50, 18,894.28 and 7,403.88 is: 10,217.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,691.50 : 18,894.28 = 7,403.88 : x
  2. Step 2: Convert to fraction form
    13,691.50/18,894.28 = 7,403.88/x
  3. Step 3: Cross multiply
    13,691.50x = 18,894.28 × 7,403.88
  4. Step 4: Simplify right side
    13,691.50x = 139,890,981.81
  5. Step 5: Solve for x
    x = 139,890,981.81/13,691.50
  6. Step 6: Final answer
    x = 10,217.36

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.