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Finding the Fourth Proportional to 1,613.35, 2,421.85 and 640.14

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Solution

The fourth proportional to 1,613.35, 2,421.85 and 640.14 is: 960.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,613.35 : 2,421.85 = 640.14 : x
  2. Step 2: Convert to fraction form
    1,613.35/2,421.85 = 640.14/x
  3. Step 3: Cross multiply
    1,613.35x = 2,421.85 × 640.14
  4. Step 4: Simplify right side
    1,613.35x = 1,550,313.58
  5. Step 5: Solve for x
    x = 1,550,313.58/1,613.35
  6. Step 6: Final answer
    x = 960.93

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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.