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Finding the Fourth Proportional to 936.47, 1,404.71 and 287.21

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Solution

The fourth proportional to 936.47, 1,404.71 and 287.21 is: 430.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    936.47 : 1,404.71 = 287.21 : x
  2. Step 2: Convert to fraction form
    936.47/1,404.71 = 287.21/x
  3. Step 3: Cross multiply
    936.47x = 1,404.71 × 287.21
  4. Step 4: Simplify right side
    936.47x = 403,446.76
  5. Step 5: Solve for x
    x = 403,446.76/936.47
  6. Step 6: Final answer
    x = 430.82

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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.