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Finding the Fourth Proportional to 12,780, 17,636.40 and 7,479.36

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Solution

The fourth proportional to 12,780, 17,636.40 and 7,479.36 is: 10,321.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,780 : 17,636.40 = 7,479.36 : x
  2. Step 2: Convert to fraction form
    12,780/17,636.40 = 7,479.36/x
  3. Step 3: Cross multiply
    12,780x = 17,636.40 × 7,479.36
  4. Step 4: Simplify right side
    12,780x = 131,908,984.70
  5. Step 5: Solve for x
    x = 131,908,984.70/12,780
  6. Step 6: Final answer
    x = 10,321.52

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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.