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Finding the Fourth Proportional to 645.84, 891.16 and 366.08

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Solution

The fourth proportional to 645.84, 891.16 and 366.08 is: 505.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    645.84 : 891.16 = 366.08 : x
  2. Step 2: Convert to fraction form
    645.84/891.16 = 366.08/x
  3. Step 3: Cross multiply
    645.84x = 891.16 × 366.08
  4. Step 4: Simplify right side
    645.84x = 326,235.85
  5. Step 5: Solve for x
    x = 326,235.85/645.84
  6. Step 6: Final answer
    x = 505.13

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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.