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Finding the Fourth Proportional to 909.99, 1,364.58 and 636.21

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Solution

The fourth proportional to 909.99, 1,364.58 and 636.21 is: 954.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    909.99 : 1,364.58 = 636.21 : x
  2. Step 2: Convert to fraction form
    909.99/1,364.58 = 636.21/x
  3. Step 3: Cross multiply
    909.99x = 1,364.58 × 636.21
  4. Step 4: Simplify right side
    909.99x = 868,159.44
  5. Step 5: Solve for x
    x = 868,159.44/909.99
  6. Step 6: Final answer
    x = 954.03

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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.