Home / 13,221.36-18,248.65-8,979.49

Finding the Fourth Proportional to 13,221.36, 18,248.65 and 8,979.49

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Solution

The fourth proportional to 13,221.36, 18,248.65 and 8,979.49 is: 12,393.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,221.36 : 18,248.65 = 8,979.49 : x
  2. Step 2: Convert to fraction form
    13,221.36/18,248.65 = 8,979.49/x
  3. Step 3: Cross multiply
    13,221.36x = 18,248.65 × 8,979.49
  4. Step 4: Simplify right side
    13,221.36x = 163,863,570.19
  5. Step 5: Solve for x
    x = 163,863,570.19/13,221.36
  6. Step 6: Final answer
    x = 12,393.85

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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.