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Finding the Fourth Proportional to 13,398.21, 18,489.18 and 7,429.86

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Solution

The fourth proportional to 13,398.21, 18,489.18 and 7,429.86 is: 10,253.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,398.21 : 18,489.18 = 7,429.86 : x
  2. Step 2: Convert to fraction form
    13,398.21/18,489.18 = 7,429.86/x
  3. Step 3: Cross multiply
    13,398.21x = 18,489.18 × 7,429.86
  4. Step 4: Simplify right side
    13,398.21x = 137,372,018.91
  5. Step 5: Solve for x
    x = 137,372,018.91/13,398.21
  6. Step 6: Final answer
    x = 10,253.01

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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.