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Finding the Fourth Proportional to 25,636.80, 38,455.20 and 13,972.80

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Solution

The fourth proportional to 25,636.80, 38,455.20 and 13,972.80 is: 20,959.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    25,636.80 : 38,455.20 = 13,972.80 : x
  2. Step 2: Convert to fraction form
    25,636.80/38,455.20 = 13,972.80/x
  3. Step 3: Cross multiply
    25,636.80x = 38,455.20 × 13,972.80
  4. Step 4: Simplify right side
    25,636.80x = 537,326,818.56
  5. Step 5: Solve for x
    x = 537,326,818.56/25,636.80
  6. Step 6: Final answer
    x = 20,959.20

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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.