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Finding the Fourth Proportional to 1,086.67, 1,627.09 and 623.80

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Solution

The fourth proportional to 1,086.67, 1,627.09 and 623.80 is: 934.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,086.67 : 1,627.09 = 623.80 : x
  2. Step 2: Convert to fraction form
    1,086.67/1,627.09 = 623.80/x
  3. Step 3: Cross multiply
    1,086.67x = 1,627.09 × 623.80
  4. Step 4: Simplify right side
    1,086.67x = 1,014,978.74
  5. Step 5: Solve for x
    x = 1,014,978.74/1,086.67
  6. Step 6: Final answer
    x = 934.03

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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.