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Finding the Fourth Proportional to 698.29, 1,047.03 and 287.71

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Solution

The fourth proportional to 698.29, 1,047.03 and 287.71 is: 431.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    698.29 : 1,047.03 = 287.71 : x
  2. Step 2: Convert to fraction form
    698.29/1,047.03 = 287.71/x
  3. Step 3: Cross multiply
    698.29x = 1,047.03 × 287.71
  4. Step 4: Simplify right side
    698.29x = 301,241.00
  5. Step 5: Solve for x
    x = 301,241.00/698.29
  6. Step 6: Final answer
    x = 431.40

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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.