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Finding the Fourth Proportional to 5,319.12, 7,978.91 and 3,126.20

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Solution

The fourth proportional to 5,319.12, 7,978.91 and 3,126.20 is: 4,689.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    5,319.12 : 7,978.91 = 3,126.20 : x
  2. Step 2: Convert to fraction form
    5,319.12/7,978.91 = 3,126.20/x
  3. Step 3: Cross multiply
    5,319.12x = 7,978.91 × 3,126.20
  4. Step 4: Simplify right side
    5,319.12x = 24,943,612.92
  5. Step 5: Solve for x
    x = 24,943,612.92/5,319.12
  6. Step 6: Final answer
    x = 4,689.43

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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.