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Finding the Fourth Proportional to 343.65, 515.47 and 83.65

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Solution

The fourth proportional to 343.65, 515.47 and 83.65 is: 125.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    343.65 : 515.47 = 83.65 : x
  2. Step 2: Convert to fraction form
    343.65/515.47 = 83.65/x
  3. Step 3: Cross multiply
    343.65x = 515.47 × 83.65
  4. Step 4: Simplify right side
    343.65x = 43,116.76
  5. Step 5: Solve for x
    x = 43,116.76/343.65
  6. Step 6: Final answer
    x = 125.47

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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.