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Finding the Fourth Proportional to 3,924, 5,415.12 and 2,878.02

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Solution

The fourth proportional to 3,924, 5,415.12 and 2,878.02 is: 3,971.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,924 : 5,415.12 = 2,878.02 : x
  2. Step 2: Convert to fraction form
    3,924/5,415.12 = 2,878.02/x
  3. Step 3: Cross multiply
    3,924x = 5,415.12 × 2,878.02
  4. Step 4: Simplify right side
    3,924x = 15,584,823.66
  5. Step 5: Solve for x
    x = 15,584,823.66/3,924
  6. Step 6: Final answer
    x = 3,971.67

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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.