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Finding the Fourth Proportional to 5,310.88, 7,961.28 and 1,978.24

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Solution

The fourth proportional to 5,310.88, 7,961.28 and 1,978.24 is: 2,965.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    5,310.88 : 7,961.28 = 1,978.24 : x
  2. Step 2: Convert to fraction form
    5,310.88/7,961.28 = 1,978.24/x
  3. Step 3: Cross multiply
    5,310.88x = 7,961.28 × 1,978.24
  4. Step 4: Simplify right side
    5,310.88x = 15,749,322.55
  5. Step 5: Solve for x
    x = 15,749,322.55/5,310.88
  6. Step 6: Final answer
    x = 2,965.48

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.