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Finding the Fourth Proportional to 451.99, 678.61 and 346.45

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Solution

The fourth proportional to 451.99, 678.61 and 346.45 is: 520.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    451.99 : 678.61 = 346.45 : x
  2. Step 2: Convert to fraction form
    451.99/678.61 = 346.45/x
  3. Step 3: Cross multiply
    451.99x = 678.61 × 346.45
  4. Step 4: Simplify right side
    451.99x = 235,104.43
  5. Step 5: Solve for x
    x = 235,104.43/451.99
  6. Step 6: Final answer
    x = 520.15

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.