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Finding the Fourth Proportional to 356.33, 491.71 and 216.45

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Solution

The fourth proportional to 356.33, 491.71 and 216.45 is: 298.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    356.33 : 491.71 = 216.45 : x
  2. Step 2: Convert to fraction form
    356.33/491.71 = 216.45/x
  3. Step 3: Cross multiply
    356.33x = 491.71 × 216.45
  4. Step 4: Simplify right side
    356.33x = 106,430.63
  5. Step 5: Solve for x
    x = 106,430.63/356.33
  6. Step 6: Final answer
    x = 298.69

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.