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Finding the Fourth Proportional to 689.81, 1,035.12 and 257.27

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Solution

The fourth proportional to 689.81, 1,035.12 and 257.27 is: 386.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    689.81 : 1,035.12 = 257.27 : x
  2. Step 2: Convert to fraction form
    689.81/1,035.12 = 257.27/x
  3. Step 3: Cross multiply
    689.81x = 1,035.12 × 257.27
  4. Step 4: Simplify right side
    689.81x = 266,300.15
  5. Step 5: Solve for x
    x = 266,300.15/689.81
  6. Step 6: Final answer
    x = 386.05

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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.