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Finding the Fourth Proportional to 407.09, 561.62 and 282.85

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Solution

The fourth proportional to 407.09, 561.62 and 282.85 is: 390.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    407.09 : 561.62 = 282.85 : x
  2. Step 2: Convert to fraction form
    407.09/561.62 = 282.85/x
  3. Step 3: Cross multiply
    407.09x = 561.62 × 282.85
  4. Step 4: Simplify right side
    407.09x = 158,854.22
  5. Step 5: Solve for x
    x = 158,854.22/407.09
  6. Step 6: Final answer
    x = 390.22

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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.