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Finding the Fourth Proportional to 657.84, 986.64 and 219.09

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Solution

The fourth proportional to 657.84, 986.64 and 219.09 is: 328.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    657.84 : 986.64 = 219.09 : x
  2. Step 2: Convert to fraction form
    657.84/986.64 = 219.09/x
  3. Step 3: Cross multiply
    657.84x = 986.64 × 219.09
  4. Step 4: Simplify right side
    657.84x = 216,162.96
  5. Step 5: Solve for x
    x = 216,162.96/657.84
  6. Step 6: Final answer
    x = 328.60

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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.