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Finding the Fourth Proportional to 3,655.90, 5,485.20 and 3,520.90

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Solution

The fourth proportional to 3,655.90, 5,485.20 and 3,520.90 is: 5,282.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,655.90 : 5,485.20 = 3,520.90 : x
  2. Step 2: Convert to fraction form
    3,655.90/5,485.20 = 3,520.90/x
  3. Step 3: Cross multiply
    3,655.90x = 5,485.20 × 3,520.90
  4. Step 4: Simplify right side
    3,655.90x = 19,312,840.68
  5. Step 5: Solve for x
    x = 19,312,840.68/3,655.90
  6. Step 6: Final answer
    x = 5,282.65

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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.