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Finding the Fourth Proportional to 1,613.67, 2,421.50 and 639.85

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Solution

The fourth proportional to 1,613.67, 2,421.50 and 639.85 is: 960.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,613.67 : 2,421.50 = 639.85 : x
  2. Step 2: Convert to fraction form
    1,613.67/2,421.50 = 639.85/x
  3. Step 3: Cross multiply
    1,613.67x = 2,421.50 × 639.85
  4. Step 4: Simplify right side
    1,613.67x = 1,549,392.06
  5. Step 5: Solve for x
    x = 1,549,392.06/1,613.67
  6. Step 6: Final answer
    x = 960.17

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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.