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Finding the Fourth Proportional to 3,530.80, 5,289.80 and 2,980.40

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Solution

The fourth proportional to 3,530.80, 5,289.80 and 2,980.40 is: 4,465.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,530.80 : 5,289.80 = 2,980.40 : x
  2. Step 2: Convert to fraction form
    3,530.80/5,289.80 = 2,980.40/x
  3. Step 3: Cross multiply
    3,530.80x = 5,289.80 × 2,980.40
  4. Step 4: Simplify right side
    3,530.80x = 15,765,719.92
  5. Step 5: Solve for x
    x = 15,765,719.92/3,530.80
  6. Step 6: Final answer
    x = 4,465.20

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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.