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Finding the Fourth Proportional to 406.58, 561.33 and 387.18

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Solution

The fourth proportional to 406.58, 561.33 and 387.18 is: 534.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    406.58 : 561.33 = 387.18 : x
  2. Step 2: Convert to fraction form
    406.58/561.33 = 387.18/x
  3. Step 3: Cross multiply
    406.58x = 561.33 × 387.18
  4. Step 4: Simplify right side
    406.58x = 217,335.75
  5. Step 5: Solve for x
    x = 217,335.75/406.58
  6. Step 6: Final answer
    x = 534.55

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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.