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Finding the Fourth Proportional to 3,579.90, 5,369.21 and 947.43

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Solution

The fourth proportional to 3,579.90, 5,369.21 and 947.43 is: 1,420.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,579.90 : 5,369.21 = 947.43 : x
  2. Step 2: Convert to fraction form
    3,579.90/5,369.21 = 947.43/x
  3. Step 3: Cross multiply
    3,579.90x = 5,369.21 × 947.43
  4. Step 4: Simplify right side
    3,579.90x = 5,086,950.63
  5. Step 5: Solve for x
    x = 5,086,950.63/3,579.90
  6. Step 6: Final answer
    x = 1,420.98

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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.