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Finding the Fourth Proportional to 406.87, 561.20 and 373.78

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Solution

The fourth proportional to 406.87, 561.20 and 373.78 is: 515.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    406.87 : 561.20 = 373.78 : x
  2. Step 2: Convert to fraction form
    406.87/561.20 = 373.78/x
  3. Step 3: Cross multiply
    406.87x = 561.20 × 373.78
  4. Step 4: Simplify right side
    406.87x = 209,764.17
  5. Step 5: Solve for x
    x = 209,764.17/406.87
  6. Step 6: Final answer
    x = 515.55

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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.