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Finding the Fourth Proportional to 646.66, 969.99 and 207.91

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Solution

The fourth proportional to 646.66, 969.99 and 207.91 is: 311.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    646.66 : 969.99 = 207.91 : x
  2. Step 2: Convert to fraction form
    646.66/969.99 = 207.91/x
  3. Step 3: Cross multiply
    646.66x = 969.99 × 207.91
  4. Step 4: Simplify right side
    646.66x = 201,668.20
  5. Step 5: Solve for x
    x = 201,668.20/646.66
  6. Step 6: Final answer
    x = 311.86

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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.