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Finding the Fourth Proportional to 407.09, 561.90 and 282.90

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Solution

The fourth proportional to 407.09, 561.90 and 282.90 is: 390.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    407.09 : 561.90 = 282.90 : x
  2. Step 2: Convert to fraction form
    407.09/561.90 = 282.90/x
  3. Step 3: Cross multiply
    407.09x = 561.90 × 282.90
  4. Step 4: Simplify right side
    407.09x = 158,961.51
  5. Step 5: Solve for x
    x = 158,961.51/407.09
  6. Step 6: Final answer
    x = 390.49

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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.