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Finding the Fourth Proportional to 697.27, 1,045.89 and 286.43

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Solution

The fourth proportional to 697.27, 1,045.89 and 286.43 is: 429.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    697.27 : 1,045.89 = 286.43 : x
  2. Step 2: Convert to fraction form
    697.27/1,045.89 = 286.43/x
  3. Step 3: Cross multiply
    697.27x = 1,045.89 × 286.43
  4. Step 4: Simplify right side
    697.27x = 299,574.27
  5. Step 5: Solve for x
    x = 299,574.27/697.27
  6. Step 6: Final answer
    x = 429.64

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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.