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Finding the Fourth Proportional to 633.12, 949.76 and 286.40

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Solution

The fourth proportional to 633.12, 949.76 and 286.40 is: 429.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    633.12 : 949.76 = 286.40 : x
  2. Step 2: Convert to fraction form
    633.12/949.76 = 286.40/x
  3. Step 3: Cross multiply
    633.12x = 949.76 × 286.40
  4. Step 4: Simplify right side
    633.12x = 272,011.26
  5. Step 5: Solve for x
    x = 272,011.26/633.12
  6. Step 6: Final answer
    x = 429.64

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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.