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Finding the Fourth Proportional to 13,398.39, 18,490.92 and 7,431.99

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Solution

The fourth proportional to 13,398.39, 18,490.92 and 7,431.99 is: 10,256.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,398.39 : 18,490.92 = 7,431.99 : x
  2. Step 2: Convert to fraction form
    13,398.39/18,490.92 = 7,431.99/x
  3. Step 3: Cross multiply
    13,398.39x = 18,490.92 × 7,431.99
  4. Step 4: Simplify right side
    13,398.39x = 137,424,332.53
  5. Step 5: Solve for x
    x = 137,424,332.53/13,398.39
  6. Step 6: Final answer
    x = 10,256.78

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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.