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Finding the Fourth Proportional to 645.88, 891.38 and 366.16

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Solution

The fourth proportional to 645.88, 891.38 and 366.16 is: 505.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    645.88 : 891.38 = 366.16 : x
  2. Step 2: Convert to fraction form
    645.88/891.38 = 366.16/x
  3. Step 3: Cross multiply
    645.88x = 891.38 × 366.16
  4. Step 4: Simplify right side
    645.88x = 326,387.70
  5. Step 5: Solve for x
    x = 326,387.70/645.88
  6. Step 6: Final answer
    x = 505.34

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.