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Finding the Fourth Proportional to 340.21, 509.92 and 145.15

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Solution

The fourth proportional to 340.21, 509.92 and 145.15 is: 217.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    340.21 : 509.92 = 145.15 : x
  2. Step 2: Convert to fraction form
    340.21/509.92 = 145.15/x
  3. Step 3: Cross multiply
    340.21x = 509.92 × 145.15
  4. Step 4: Simplify right side
    340.21x = 74,014.16
  5. Step 5: Solve for x
    x = 74,014.16/340.21
  6. Step 6: Final answer
    x = 217.55

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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.