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Finding the Fourth Proportional to 414.40, 621.53 and 140.46

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Solution

The fourth proportional to 414.40, 621.53 and 140.46 is: 210.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    414.40 : 621.53 = 140.46 : x
  2. Step 2: Convert to fraction form
    414.40/621.53 = 140.46/x
  3. Step 3: Cross multiply
    414.40x = 621.53 × 140.46
  4. Step 4: Simplify right side
    414.40x = 87,300.10
  5. Step 5: Solve for x
    x = 87,300.10/414.40
  6. Step 6: Final answer
    x = 210.67

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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.