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Finding the Fourth Proportional to 5,619.78, 7,756.90 and 3,261.47

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Solution

The fourth proportional to 5,619.78, 7,756.90 and 3,261.47 is: 4,501.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    5,619.78 : 7,756.90 = 3,261.47 : x
  2. Step 2: Convert to fraction form
    5,619.78/7,756.90 = 3,261.47/x
  3. Step 3: Cross multiply
    5,619.78x = 7,756.90 × 3,261.47
  4. Step 4: Simplify right side
    5,619.78x = 25,298,849.70
  5. Step 5: Solve for x
    x = 25,298,849.70/5,619.78
  6. Step 6: Final answer
    x = 4,501.75

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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.