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Finding the Fourth Proportional to 3,720.79, 5,581.32 and 1,870.90

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Solution

The fourth proportional to 3,720.79, 5,581.32 and 1,870.90 is: 2,806.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,720.79 : 5,581.32 = 1,870.90 : x
  2. Step 2: Convert to fraction form
    3,720.79/5,581.32 = 1,870.90/x
  3. Step 3: Cross multiply
    3,720.79x = 5,581.32 × 1,870.90
  4. Step 4: Simplify right side
    3,720.79x = 10,442,082.23
  5. Step 5: Solve for x
    x = 10,442,082.23/3,720.79
  6. Step 6: Final answer
    x = 2,806.42

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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.