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Finding the Fourth Proportional to 642.05, 961.65 and 591.47

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Solution

The fourth proportional to 642.05, 961.65 and 591.47 is: 885.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    642.05 : 961.65 = 591.47 : x
  2. Step 2: Convert to fraction form
    642.05/961.65 = 591.47/x
  3. Step 3: Cross multiply
    642.05x = 961.65 × 591.47
  4. Step 4: Simplify right side
    642.05x = 568,782.32
  5. Step 5: Solve for x
    x = 568,782.32/642.05
  6. Step 6: Final answer
    x = 885.89

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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.