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Finding the Fourth Proportional to 675.39, 1,011.20 and 345.62

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Solution

The fourth proportional to 675.39, 1,011.20 and 345.62 is: 517.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    675.39 : 1,011.20 = 345.62 : x
  2. Step 2: Convert to fraction form
    675.39/1,011.20 = 345.62/x
  3. Step 3: Cross multiply
    675.39x = 1,011.20 × 345.62
  4. Step 4: Simplify right side
    675.39x = 349,490.94
  5. Step 5: Solve for x
    x = 349,490.94/675.39
  6. Step 6: Final answer
    x = 517.47

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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.