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Finding the Fourth Proportional to 3,720.64, 5,580.80 and 1,123.50

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Solution

The fourth proportional to 3,720.64, 5,580.80 and 1,123.50 is: 1,685.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,720.64 : 5,580.80 = 1,123.50 : x
  2. Step 2: Convert to fraction form
    3,720.64/5,580.80 = 1,123.50/x
  3. Step 3: Cross multiply
    3,720.64x = 5,580.80 × 1,123.50
  4. Step 4: Simplify right side
    3,720.64x = 6,270,028.80
  5. Step 5: Solve for x
    x = 6,270,028.80/3,720.64
  6. Step 6: Final answer
    x = 1,685.20

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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.