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Finding the Fourth Proportional to 689.66, 1,035 and 381.77

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Solution

The fourth proportional to 689.66, 1,035 and 381.77 is: 572.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    689.66 : 1,035 = 381.77 : x
  2. Step 2: Convert to fraction form
    689.66/1,035 = 381.77/x
  3. Step 3: Cross multiply
    689.66x = 1,035 × 381.77
  4. Step 4: Simplify right side
    689.66x = 395,131.95
  5. Step 5: Solve for x
    x = 395,131.95/689.66
  6. Step 6: Final answer
    x = 572.94

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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.