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Finding the Fourth Proportional to 697.79, 1,046.28 and 287.21

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Solution

The fourth proportional to 697.79, 1,046.28 and 287.21 is: 430.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    697.79 : 1,046.28 = 287.21 : x
  2. Step 2: Convert to fraction form
    697.79/1,046.28 = 287.21/x
  3. Step 3: Cross multiply
    697.79x = 1,046.28 × 287.21
  4. Step 4: Simplify right side
    697.79x = 300,502.08
  5. Step 5: Solve for x
    x = 300,502.08/697.79
  6. Step 6: Final answer
    x = 430.65

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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.