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Finding the Fourth Proportional to 340.28, 509.28 and 258.66

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Solution

The fourth proportional to 340.28, 509.28 and 258.66 is: 387.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    340.28 : 509.28 = 258.66 : x
  2. Step 2: Convert to fraction form
    340.28/509.28 = 258.66/x
  3. Step 3: Cross multiply
    340.28x = 509.28 × 258.66
  4. Step 4: Simplify right side
    340.28x = 131,730.36
  5. Step 5: Solve for x
    x = 131,730.36/340.28
  6. Step 6: Final answer
    x = 387.13

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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.