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Finding the Fourth Proportional to 12,780.11, 17,636.74 and 7,115.11

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Solution

The fourth proportional to 12,780.11, 17,636.74 and 7,115.11 is: 9,818.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,780.11 : 17,636.74 = 7,115.11 : x
  2. Step 2: Convert to fraction form
    12,780.11/17,636.74 = 7,115.11/x
  3. Step 3: Cross multiply
    12,780.11x = 17,636.74 × 7,115.11
  4. Step 4: Simplify right side
    12,780.11x = 125,487,283.26
  5. Step 5: Solve for x
    x = 125,487,283.26/12,780.11
  6. Step 6: Final answer
    x = 9,818.95

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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.