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Finding the Fourth Proportional to 407.74, 562.69 and 221.23

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Solution

The fourth proportional to 407.74, 562.69 and 221.23 is: 305.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    407.74 : 562.69 = 221.23 : x
  2. Step 2: Convert to fraction form
    407.74/562.69 = 221.23/x
  3. Step 3: Cross multiply
    407.74x = 562.69 × 221.23
  4. Step 4: Simplify right side
    407.74x = 124,482.80
  5. Step 5: Solve for x
    x = 124,482.80/407.74
  6. Step 6: Final answer
    x = 305.30

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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.