Home / 13,479.40-18,663.78-13,220.20

Finding the Fourth Proportional to 13,479.40, 18,663.78 and 13,220.20

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Solution

The fourth proportional to 13,479.40, 18,663.78 and 13,220.20 is: 18,304.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,479.40 : 18,663.78 = 13,220.20 : x
  2. Step 2: Convert to fraction form
    13,479.40/18,663.78 = 13,220.20/x
  3. Step 3: Cross multiply
    13,479.40x = 18,663.78 × 13,220.20
  4. Step 4: Simplify right side
    13,479.40x = 246,738,904.36
  5. Step 5: Solve for x
    x = 246,738,904.36/13,479.40
  6. Step 6: Final answer
    x = 18,304.89

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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.