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Finding the Fourth Proportional to 3,720.42, 5,580.63 and 1,411.92

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Solution

The fourth proportional to 3,720.42, 5,580.63 and 1,411.92 is: 2,117.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,720.42 : 5,580.63 = 1,411.92 : x
  2. Step 2: Convert to fraction form
    3,720.42/5,580.63 = 1,411.92/x
  3. Step 3: Cross multiply
    3,720.42x = 5,580.63 × 1,411.92
  4. Step 4: Simplify right side
    3,720.42x = 7,879,403.11
  5. Step 5: Solve for x
    x = 7,879,403.11/3,720.42
  6. Step 6: Final answer
    x = 2,117.88

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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.