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Finding the Fourth Proportional to 13,691.12, 18,893.78 and 7,403.56

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Solution

The fourth proportional to 13,691.12, 18,893.78 and 7,403.56 is: 10,216.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,691.12 : 18,893.78 = 7,403.56 : x
  2. Step 2: Convert to fraction form
    13,691.12/18,893.78 = 7,403.56/x
  3. Step 3: Cross multiply
    13,691.12x = 18,893.78 × 7,403.56
  4. Step 4: Simplify right side
    13,691.12x = 139,881,233.86
  5. Step 5: Solve for x
    x = 139,881,233.86/13,691.12
  6. Step 6: Final answer
    x = 10,216.93

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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.