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Finding the Fourth Proportional to 450.75, 621.80 and 284.90

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Solution

The fourth proportional to 450.75, 621.80 and 284.90 is: 393.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    450.75 : 621.80 = 284.90 : x
  2. Step 2: Convert to fraction form
    450.75/621.80 = 284.90/x
  3. Step 3: Cross multiply
    450.75x = 621.80 × 284.90
  4. Step 4: Simplify right side
    450.75x = 177,151.31
  5. Step 5: Solve for x
    x = 177,151.31/450.75
  6. Step 6: Final answer
    x = 393.01

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Find fourth proportional to 225.38, 310.90 and 142.45
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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.