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Finding the Fourth Proportional to 445.40, 665.51 and 340.67

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Solution

The fourth proportional to 445.40, 665.51 and 340.67 is: 509.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    445.40 : 665.51 = 340.67 : x
  2. Step 2: Convert to fraction form
    445.40/665.51 = 340.67/x
  3. Step 3: Cross multiply
    445.40x = 665.51 × 340.67
  4. Step 4: Simplify right side
    445.40x = 226,719.29
  5. Step 5: Solve for x
    x = 226,719.29/445.40
  6. Step 6: Final answer
    x = 509.02

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.