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Finding the Fourth Proportional to 10,878.78, 15,012.66 and 5,910.78

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Solution

The fourth proportional to 10,878.78, 15,012.66 and 5,910.78 is: 8,156.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    10,878.78 : 15,012.66 = 5,910.78 : x
  2. Step 2: Convert to fraction form
    10,878.78/15,012.66 = 5,910.78/x
  3. Step 3: Cross multiply
    10,878.78x = 15,012.66 × 5,910.78
  4. Step 4: Simplify right side
    10,878.78x = 88,736,530.47
  5. Step 5: Solve for x
    x = 88,736,530.47/10,878.78
  6. Step 6: Final answer
    x = 8,156.85

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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.