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Finding the Fourth Proportional to 408.45, 612.70 and 340.46

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Solution

The fourth proportional to 408.45, 612.70 and 340.46 is: 510.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    408.45 : 612.70 = 340.46 : x
  2. Step 2: Convert to fraction form
    408.45/612.70 = 340.46/x
  3. Step 3: Cross multiply
    408.45x = 612.70 × 340.46
  4. Step 4: Simplify right side
    408.45x = 208,595.93
  5. Step 5: Solve for x
    x = 208,595.93/408.45
  6. Step 6: Final answer
    x = 510.70

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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.