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Finding the Fourth Proportional to 356.47, 491.74 and 223.63

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Solution

The fourth proportional to 356.47, 491.74 and 223.63 is: 308.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    356.47 : 491.74 = 223.63 : x
  2. Step 2: Convert to fraction form
    356.47/491.74 = 223.63/x
  3. Step 3: Cross multiply
    356.47x = 491.74 × 223.63
  4. Step 4: Simplify right side
    356.47x = 109,966.03
  5. Step 5: Solve for x
    x = 109,966.03/356.47
  6. Step 6: Final answer
    x = 308.49

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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.