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Finding the Fourth Proportional to 25,644.80, 38,467.20 and 13,980.80

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Solution

The fourth proportional to 25,644.80, 38,467.20 and 13,980.80 is: 20,971.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    25,644.80 : 38,467.20 = 13,980.80 : x
  2. Step 2: Convert to fraction form
    25,644.80/38,467.20 = 13,980.80/x
  3. Step 3: Cross multiply
    25,644.80x = 38,467.20 × 13,980.80
  4. Step 4: Simplify right side
    25,644.80x = 537,802,229.76
  5. Step 5: Solve for x
    x = 537,802,229.76/25,644.80
  6. Step 6: Final answer
    x = 20,971.20

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.