Home / 11,415.78-15,752.70-6,378.39

Finding the Fourth Proportional to 11,415.78, 15,752.70 and 6,378.39

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Solution

The fourth proportional to 11,415.78, 15,752.70 and 6,378.39 is: 8,801.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    11,415.78 : 15,752.70 = 6,378.39 : x
  2. Step 2: Convert to fraction form
    11,415.78/15,752.70 = 6,378.39/x
  3. Step 3: Cross multiply
    11,415.78x = 15,752.70 × 6,378.39
  4. Step 4: Simplify right side
    11,415.78x = 100,476,864.15
  5. Step 5: Solve for x
    x = 100,476,864.15/11,415.78
  6. Step 6: Final answer
    x = 8,801.58

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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.