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Finding the Fourth Proportional to 3,158.76, 4,359 and 1,980.48

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Solution

The fourth proportional to 3,158.76, 4,359 and 1,980.48 is: 2,733.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,158.76 : 4,359 = 1,980.48 : x
  2. Step 2: Convert to fraction form
    3,158.76/4,359 = 1,980.48/x
  3. Step 3: Cross multiply
    3,158.76x = 4,359 × 1,980.48
  4. Step 4: Simplify right side
    3,158.76x = 8,632,912.32
  5. Step 5: Solve for x
    x = 8,632,912.32/3,158.76
  6. Step 6: Final answer
    x = 2,733.01

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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.