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Finding the Fourth Proportional to 640.17, 961.35 and 608.25

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Solution

The fourth proportional to 640.17, 961.35 and 608.25 is: 913.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    640.17 : 961.35 = 608.25 : x
  2. Step 2: Convert to fraction form
    640.17/961.35 = 608.25/x
  3. Step 3: Cross multiply
    640.17x = 961.35 × 608.25
  4. Step 4: Simplify right side
    640.17x = 584,741.14
  5. Step 5: Solve for x
    x = 584,741.14/640.17
  6. Step 6: Final answer
    x = 913.42

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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.