Home / 3,720.05-5,580.29-1,221.40

Finding the Fourth Proportional to 3,720.05, 5,580.29 and 1,221.40

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Solution

The fourth proportional to 3,720.05, 5,580.29 and 1,221.40 is: 1,832.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,720.05 : 5,580.29 = 1,221.40 : x
  2. Step 2: Convert to fraction form
    3,720.05/5,580.29 = 1,221.40/x
  3. Step 3: Cross multiply
    3,720.05x = 5,580.29 × 1,221.40
  4. Step 4: Simplify right side
    3,720.05x = 6,815,776.23
  5. Step 5: Solve for x
    x = 6,815,776.23/3,720.05
  6. Step 6: Final answer
    x = 1,832.17

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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.