Home / 3,989.80-5,505-2,417.56

Finding the Fourth Proportional to 3,989.80, 5,505 and 2,417.56

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Solution

The fourth proportional to 3,989.80, 5,505 and 2,417.56 is: 3,335.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,989.80 : 5,505 = 2,417.56 : x
  2. Step 2: Convert to fraction form
    3,989.80/5,505 = 2,417.56/x
  3. Step 3: Cross multiply
    3,989.80x = 5,505 × 2,417.56
  4. Step 4: Simplify right side
    3,989.80x = 13,308,667.80
  5. Step 5: Solve for x
    x = 13,308,667.80/3,989.80
  6. Step 6: Final answer
    x = 3,335.67

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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.