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Finding the Fourth Proportional to 13,780.61, 20,671.15 and 3,920.15

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Solution

The fourth proportional to 13,780.61, 20,671.15 and 3,920.15 is: 5,880.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,780.61 : 20,671.15 = 3,920.15 : x
  2. Step 2: Convert to fraction form
    13,780.61/20,671.15 = 3,920.15/x
  3. Step 3: Cross multiply
    13,780.61x = 20,671.15 × 3,920.15
  4. Step 4: Simplify right side
    13,780.61x = 81,033,941.63
  5. Step 5: Solve for x
    x = 81,033,941.63/13,780.61
  6. Step 6: Final answer
    x = 5,880.29

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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.