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Finding the Fourth Proportional to 3,721.16, 5,581.44 and 947.72

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Solution

The fourth proportional to 3,721.16, 5,581.44 and 947.72 is: 1,421.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,721.16 : 5,581.44 = 947.72 : x
  2. Step 2: Convert to fraction form
    3,721.16/5,581.44 = 947.72/x
  3. Step 3: Cross multiply
    3,721.16x = 5,581.44 × 947.72
  4. Step 4: Simplify right side
    3,721.16x = 5,289,656.27
  5. Step 5: Solve for x
    x = 5,289,656.27/3,721.16
  6. Step 6: Final answer
    x = 1,421.51

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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.