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Finding the Fourth Proportional to 407.16, 561.88 and 220.65

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Solution

The fourth proportional to 407.16, 561.88 and 220.65 is: 304.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    407.16 : 561.88 = 220.65 : x
  2. Step 2: Convert to fraction form
    407.16/561.88 = 220.65/x
  3. Step 3: Cross multiply
    407.16x = 561.88 × 220.65
  4. Step 4: Simplify right side
    407.16x = 123,978.82
  5. Step 5: Solve for x
    x = 123,978.82/407.16
  6. Step 6: Final answer
    x = 304.50

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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.