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Finding the Fourth Proportional to 5,782.32, 7,979.62 and 3,129.74

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Solution

The fourth proportional to 5,782.32, 7,979.62 and 3,129.74 is: 4,319.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    5,782.32 : 7,979.62 = 3,129.74 : x
  2. Step 2: Convert to fraction form
    5,782.32/7,979.62 = 3,129.74/x
  3. Step 3: Cross multiply
    5,782.32x = 7,979.62 × 3,129.74
  4. Step 4: Simplify right side
    5,782.32x = 24,974,135.90
  5. Step 5: Solve for x
    x = 24,974,135.90/5,782.32
  6. Step 6: Final answer
    x = 4,319.05

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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.