Home / 3,909.60-5,383.80-3,312.90

Finding the Fourth Proportional to 3,909.60, 5,383.80 and 3,312.90

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Solution

The fourth proportional to 3,909.60, 5,383.80 and 3,312.90 is: 4,562.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,909.60 : 5,383.80 = 3,312.90 : x
  2. Step 2: Convert to fraction form
    3,909.60/5,383.80 = 3,312.90/x
  3. Step 3: Cross multiply
    3,909.60x = 5,383.80 × 3,312.90
  4. Step 4: Simplify right side
    3,909.60x = 17,835,991.02
  5. Step 5: Solve for x
    x = 17,835,991.02/3,909.60
  6. Step 6: Final answer
    x = 4,562.10

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.