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Finding the Fourth Proportional to 1,125.05, 1,687.46 and 345.06

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Solution

The fourth proportional to 1,125.05, 1,687.46 and 345.06 is: 517.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,125.05 : 1,687.46 = 345.06 : x
  2. Step 2: Convert to fraction form
    1,125.05/1,687.46 = 345.06/x
  3. Step 3: Cross multiply
    1,125.05x = 1,687.46 × 345.06
  4. Step 4: Simplify right side
    1,125.05x = 582,274.95
  5. Step 5: Solve for x
    x = 582,274.95/1,125.05
  6. Step 6: Final answer
    x = 517.55

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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.