Home / 1,615.35-2,421.58-640.79

Finding the Fourth Proportional to 1,615.35, 2,421.58 and 640.79

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Solution

The fourth proportional to 1,615.35, 2,421.58 and 640.79 is: 960.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,615.35 : 2,421.58 = 640.79 : x
  2. Step 2: Convert to fraction form
    1,615.35/2,421.58 = 640.79/x
  3. Step 3: Cross multiply
    1,615.35x = 2,421.58 × 640.79
  4. Step 4: Simplify right side
    1,615.35x = 1,551,724.25
  5. Step 5: Solve for x
    x = 1,551,724.25/1,615.35
  6. Step 6: Final answer
    x = 960.61

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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.