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Finding the Fourth Proportional to 286.71, 429.75 and 209.25

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Solution

The fourth proportional to 286.71, 429.75 and 209.25 is: 313.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    286.71 : 429.75 = 209.25 : x
  2. Step 2: Convert to fraction form
    286.71/429.75 = 209.25/x
  3. Step 3: Cross multiply
    286.71x = 429.75 × 209.25
  4. Step 4: Simplify right side
    286.71x = 89,925.19
  5. Step 5: Solve for x
    x = 89,925.19/286.71
  6. Step 6: Final answer
    x = 313.65

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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.