Home / 5,403.81-7,455.15-3,990.90

Finding the Fourth Proportional to 5,403.81, 7,455.15 and 3,990.90

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Solution

The fourth proportional to 5,403.81, 7,455.15 and 3,990.90 is: 5,505.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    5,403.81 : 7,455.15 = 3,990.90 : x
  2. Step 2: Convert to fraction form
    5,403.81/7,455.15 = 3,990.90/x
  3. Step 3: Cross multiply
    5,403.81x = 7,455.15 × 3,990.90
  4. Step 4: Simplify right side
    5,403.81x = 29,752,758.14
  5. Step 5: Solve for x
    x = 29,752,758.14/5,403.81
  6. Step 6: Final answer
    x = 5,505.89

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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.