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Finding the Fourth Proportional to 13,398.64, 18,489.48 and 7,429.84

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Solution

The fourth proportional to 13,398.64, 18,489.48 and 7,429.84 is: 10,252.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,398.64 : 18,489.48 = 7,429.84 : x
  2. Step 2: Convert to fraction form
    13,398.64/18,489.48 = 7,429.84/x
  3. Step 3: Cross multiply
    13,398.64x = 18,489.48 × 7,429.84
  4. Step 4: Simplify right side
    13,398.64x = 137,373,878.08
  5. Step 5: Solve for x
    x = 137,373,878.08/13,398.64
  6. Step 6: Final answer
    x = 10,252.82

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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.