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Finding the Fourth Proportional to 13,398.80, 18,477.19 and 12,339.32

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Solution

The fourth proportional to 13,398.80, 18,477.19 and 12,339.32 is: 17,016.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,398.80 : 18,477.19 = 12,339.32 : x
  2. Step 2: Convert to fraction form
    13,398.80/18,477.19 = 12,339.32/x
  3. Step 3: Cross multiply
    13,398.80x = 18,477.19 × 12,339.32
  4. Step 4: Simplify right side
    13,398.80x = 227,995,836.88
  5. Step 5: Solve for x
    x = 227,995,836.88/13,398.80
  6. Step 6: Final answer
    x = 17,016.14

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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.