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Finding the Fourth Proportional to 407.51, 562.36 and 221

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Solution

The fourth proportional to 407.51, 562.36 and 221 is: 304.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    407.51 : 562.36 = 221 : x
  2. Step 2: Convert to fraction form
    407.51/562.36 = 221/x
  3. Step 3: Cross multiply
    407.51x = 562.36 × 221
  4. Step 4: Simplify right side
    407.51x = 124,281.56
  5. Step 5: Solve for x
    x = 124,281.56/407.51
  6. Step 6: Final answer
    x = 304.98

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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.