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Finding the Fourth Proportional to 3,980.75, 5,973.69 and 1,672.25

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Solution

The fourth proportional to 3,980.75, 5,973.69 and 1,672.25 is: 2,509.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,980.75 : 5,973.69 = 1,672.25 : x
  2. Step 2: Convert to fraction form
    3,980.75/5,973.69 = 1,672.25/x
  3. Step 3: Cross multiply
    3,980.75x = 5,973.69 × 1,672.25
  4. Step 4: Simplify right side
    3,980.75x = 9,989,503.10
  5. Step 5: Solve for x
    x = 9,989,503.10/3,980.75
  6. Step 6: Final answer
    x = 2,509.45

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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.